**Attachment 2**

**Degradation Rating Guidance**

**Specific to Various Fire Protection Program Elements**

This appendix provides guidance on the assignment of a degradation
rating to various findings.

Degradation rating guidance is provided for each of the finding
categories defined in Step 1.1.

**FIRE PREVENTION AND ADMINISTRATIVE CONTROLS PROGRAMS**

This section provides guidance on assignment of a degradation rating to
findings against the plant fire prevention program and other
administrative controls (e.g., hot work permitting, transient
combustible control programs, fire watches, etc.).

**[Findings against hot work permitting or fire watch
provisions:]{.underline}**

Degradations for fire watches for hot work can be low and high. The
following provides a general description of the applied degradation
levels:

-   **Low** degradations are warranted for inspection violations that
    will not have any significant effect on the likelihood that a fire
    might occur, or that a fire which does occur might not be promptly
    suppressed. Examples of low degradations are as follows:

    -   Fire watch not having specific familiarity with the facility at
        the location of the hot work, the hazards of the work and
        procedures for sounding an alarm at that point as determined
        from an interview after completion of a watch

    -   Improper fire watch training consisting of records showing a
        lack of required basic courses, refresher courses, and practice
        drills

    -   Cases where a portable extinguisher of the proper type is nearby
        (within 30 feet - unobstructed distance) even though watchers
        are inadequately equipped with fire extinguishers or other
        required equipment. This includes cases where a the proper
        portable extinguisher is nearby even though:

        -   Not having a portable fire extinguisher on the watch when
            one is required by the hot work permit

        -   Having a discharged or inadequately charged extinguisher

        -   Having the wrong type of extinguisher for the fire hazards
            involved or conditions at the site (dry chemical in an area
            of high wind currents)

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-   Violations of the hot work permitting program, but all normally
    required fire prevention measures (e.g., a properly equipped and
    trained fire watch) are in place.

-   Violations associated with hot work record keeping.

    -   **High** degradation implies that early suppression (by the fire
        watch) is not available. Examples of high degradations are as
        follows:

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-   Failures to implement a continuous fire watch in positions to
    observe all areas of vulnerability to a fire from the hot work
    operation

-   Failure to implement a fire watch at the site

-   Fire watch that is inadequately equipped with fire extinguishers or
    other required equipment. Inadequately equipped includes:

    -   Not having a portable fire extinguisher on the watch when one is
        required by the hot work permit

    -   Having a discharged or inadequately charged extinguisher

    -   Having the wrong type of extinguisher for the fire hazards
        involved or conditions at the site (dry chemical in an area of
        high wind currents)

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-   Fire watch failing to maintain any one of the following safe
    conditions[^1] during hot work operations:

    -   Location is free of combustibles or that combustibles that can
        not be moved are shielded against ignition

    -   Hot work equipment to be used shall be in satisfactory operating
        condition and in good repair

    -   Where combustible materials, such as paper clippings, wood
        shavings, or textile fibers are on the floor, the floor shall be
        swept clean for a radius of 35 ft

    -   Combustible floors wet down, covered with damp sand or
        fire-resistant sheets for a 35 ft. radius

-   Fire watch failing to maintain fire watch for at least ½ hour after
    completion of hot work at all required observation points

Note that fire watches compensating for temporary loss of
detection/suppression and/or barriers primarily impact early fire
detection/suppression time for ignition sources other than hot work and
are treated in their respective places in this document.

**[Findings against the combustible controls program:]{.underline}**

Another finding which potentially can affect frequency is violation of
transient combustible control limits, specifically those combustibles
which could result in the ignition of a fire from existing sources of
heat or electrical energy. Transient combustibles of significance from a
fire frequency standpoint are considered to be low flashpoint liquids
(below 200 °F) and self igniting combustibles (oily rags). In addition
to combustibles, evidence of tobacco smoking or the existence of
unauthorized heaters or heat sources can also be considered as adversely
affecting compartment fire frequency.

Degradations ratings for findings against the combustible controls
program are either low or high (no moderate level is defined). Examples
of low and high degradations are as follows:

-   **Low** degradation:

    -   Low flashpoint combustible liquids in quantities above those
        allowed by plant regulations but in approved containers

-   **High** degradation:

    -   A measurable quantity of a low flashpoint (200°F) combustible
        liquid beyond the quantity allowed by the plant's combustible
        loading controls, unattended, and not in an approved container.

    -   Unattended storage of self heating materials such as oily rags
        not in an approved container

    -   Evidence of smoking in a non-smoking area

    -   An unapproved heater or heat source in the area

        **FIXED FIRE DETECTION & SUPPRESSION DEGRADATION**

        **[Fire Detection:]{.underline}**

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-   **Low** degradation:

    -   If an area has a degraded detection system, but there is a
        redundant undegraded detection system in the area

    -   Less than 10% of smoke or heat detectors are degraded
        (nonfunctional, misplaced or missing), and functional detection
        is available near combustibles of concern. (Not applicable for
        areas with the potential for unconfined combustible or flammable
        liquid fire)

    -   Less than 25% detectors (heat or smoke) degraded (nonfunctional,
        misplaced or missing) in continuously occupied areas

-   **Moderate** degradation: A degradation level between Low and High.

-   **High** degradation: System will fail to function

    -   Power off

    -   Detectors incompatible with system

    -   Annunciators disabled, inaudible, or nonfunctional

        **[Water Based Suppression:]{.underline}**

        -   **Low** degradation:

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-   Less than 10% of heads are non functional **and**

> There is an functional head is within 10 feet of combustibles of
> concern, **and**
>
> System is nominally code compliant.

-   **Moderate** degradation:

    -   Less than 25% of the heads are non functional **or**

    -   The closest functional head is between 10 and 20 feet of
        combustibles of

    -   concern.

-   **High** degradation:

    -   Non functional system, **or**

    -   25% or more of heads out of service, **or**

    -   Nearest head greater than 20 feet from combustibles of concern.

        **[Gaseous Based Suppression:]{.underline}**

Note: Depending on the type of degradation, for example, a hole that
goes to the control room,

a low degradation, may be problematic. Meaning, the system may be
effective at extinguishing

but the system may cause control room evacuation or the donning of SCBAs
by the control room operators.

-   **Low** degradation:

    -   Hole in wall or floor less than area of one five inch diameter
        penetration seal (Not to control room or remote shutdown area)

    -   Hole in ceiling up to 100 square inches (Not to control room or
        remote shutdown area)

    -   Time delay in system operation of exceeds design by 60 seconds
        or less

    -   Discharge heads are obstructed

    -   Discharge time exceeds allowable by less that 25%

    -   Lack of test data

    -   Test data shows concentration for 15 minutes (where 20 minutes
        are required for licensing basis)

    -   Achievable concentration is Halon 6% (where 7% is committed), or
        CO2 50% (where 60% is committed)

-   **Moderate** degradation:

    -   Design concentration achieved but cannot be maintained for
        sufficient time to ensure fire extinguishment

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-   **High** degradation: System will fail to function

    -   Power off

    -   Inadequate agent to achieve required concentration for deep
        seated fires: Halon less than 5%; CO2 less than 40%.

        **FIRE BARRIER DEGRADATION** - Fire Confinement and Localized
        Cable or Component Protection

The approach to assigning a degradation rating to fire confinement and
localized cable or component protection findings (see Step 1.1) is
similar. The analysis approach for quantifying these two finding
categories is also similar. These two categories cover findings of
degradation to any passive fire barrier feature.

For fire barriers, four levels of degradation have been defined. In
particular, the moderate degradation level has been split into two
sub-levels; namely, 'Moderate A' and 'Moderate B'.

Moderate B will reflect a more severe level of degradation than Moderate
A, although consistent with the generic definition of a moderate
degradation, both rankings will imply that some substantial credit will
be given despite the observed degradation. This distinction allows for
additional discrimination in assessing performance degradations against
a fire barrier or barrier element.

  ----------------- -----------------------------------------------------
  **Table A2.1 -    
  Degradation       
  Levels for        
  Application to    
  Fire Barriers and 
  Barrier           
  Elements**        

  **Low**           Minor defect observed that will have no effect on
                    fire endurance, no performance reduction applied

  **Moderate A**    Fire barrier performance is reduced to approximately
                    65% of nominal fire endurance rating

  **Moderate B**    Fire barrier performance is reduced to approximately
                    35% of nominal fire endurance rating

  **High**          No Fire barrier or fire barrier/penetration integrity
                    is severely challenged - No credit for barrier
  ----------------- -----------------------------------------------------

The guidance for assigning one of the above degradation levels depends
on the type of fire barrier being considered. The table on the following
pages provides examples to illustrate how an observed degradation is
correlated to a degradation rating for each of several fire barrier
types. The inspector should select the fire barrier type that most
closely matches the barrier being considered and continue the
evaluation.

+--------+--------------+--------------+--------------+---------------+
| *      |              |              |              |               |
| *Table |              |              |              |               |
| A2.2 - |              |              |              |               |
| Gu     |              |              |              |               |
| idance |              |              |              |               |
| for    |              |              |              |               |
| R      |              |              |              |               |
| anking |              |              |              |               |
| an     |              |              |              |               |
| Ob     |              |              |              |               |
| served |              |              |              |               |
| Fire   |              |              |              |               |
| B      |              |              |              |               |
| arrier |              |              |              |               |
| Degra  |              |              |              |               |
| dation |              |              |              |               |
| Fin    |              |              |              |               |
| ding** |              |              |              |               |
|        |              |              |              |               |
| *      |              |              |              |               |
| *Based |              |              |              |               |
| on the |              |              |              |               |
| Type   |              |              |              |               |
| of     |              |              |              |               |
| B      |              |              |              |               |
| arrier |              |              |              |               |
| System |              |              |              |               |
| A      |              |              |              |               |
| gainst |              |              |              |               |
| Which  |              |              |              |               |
| the    |              |              |              |               |
| Degra  |              |              |              |               |
| dation |              |              |              |               |
| Has    |              |              |              |               |
| Been   |              |              |              |               |
| N      |              |              |              |               |
| oted** |              |              |              |               |
+--------+--------------+--------------+--------------+---------------+
| **B    | **Cha        |              |              |               |
| arrier | racteristics |              |              |               |
| Type** | Associated   |              |              |               |
|        | with Each    |              |              |               |
|        | Degradation  |              |              |               |
|        | Level**      |              |              |               |
+--------+--------------+--------------+--------------+---------------+
|        | **Low**      | **Moderate   | **Moderate   | **High**      |
|        |              | A**          | B**          |               |
+--------+--------------+--------------+--------------+---------------+
| Elast  | -   Less     | -   10 to    | -   Greater  | -   No tested |
| omers: |     than 10% |     25% of   |     than     |     or        |
| low    |     of req'd |     seal     |     3/8\"    |     evaluated |
|        |     seal     |     req'd    |     cracks   |     seal      |
| de     |     depth    |     depth is |     in seal  |               |
| nsity/ |     missing  |     missing  |     material | configuration |
| high   |              |              |     extend   |     and less  |
| d      | -   Barrier  | -   Poor     |     to       |     than 6    |
| ensity | s/components |     quality  |     opposite |     inches of |
|        |     not in   |     foam     |     face     |     foam      |
| (e.g., |              |     cell     |              |               |
| si     | preventative |              | -   No       | -   50%       |
| licone |              |    structure |     tested   |     required  |
|        |  maintenance |     (falls   |     or       |     barrier   |
| foam)  |     program  |     within   |              |     depth     |
|        |              |     Dow      |    evaluated |     removed   |
|        | -   Seal     |              |     c        |     or never  |
|        |              |    Corning's | onfiguration |     installed |
|        |    materials |     #6       |     between  |               |
|        |     not      |              |     6 and 9  | -   Through   |
|        |     listed   |    category) |     inches   |     crack or  |
|        |     in       |     of       |              |               |
|        |     program  |     a        |              |    equivalent |
|        |              | pproximately |              |     diameter  |
|        | -   Greater  |     \>25% of |              |     greater   |
|        |     than 12  |     the      |              |     1\"       |
|        |     inches   |     surface  |              |               |
|        |     of       |     area     |              |               |
|        |     material |              |              |               |
|        |              | -   No       |              |               |
|        | -   Poor     |     tested   |              |               |
|        |     quality  |     or       |              |               |
|        |     foam     |              |              |               |
|        |     cell     |    evaluated |              |               |
|        |              |     c        |              |               |
|        |    structure | onfiguration |              |               |
|        |     (falls   |     between  |              |               |
|        |     within   |     9 and 11 |              |               |
|        |     Dow      |     inches   |              |               |
|        |              |     depth    |              |               |
|        |    Corning's |              |              |               |
|        |     #6       |              |              |               |
|        |              |              |              |               |
|        |    category) |              |              |               |
|        |     over     |              |              |               |
|        |     \<25% of |              |              |               |
|        |     the      |              |              |               |
|        |     surface  |              |              |               |
|        |     area     |              |              |               |
|        |              |              |              |               |
|        | -   Through  |              |              |               |
|        |     cracks   |              |              |               |
|        |     smaller  |              |              |               |
|        |     than     |              |              |               |
|        |     1/8\" in |              |              |               |
|        |     seal     |              |              |               |
|        |     material |              |              |               |
|        |     that are |              |              |               |
|        |     less     |              |              |               |
|        |     than 50% |              |              |               |
|        |     of the   |              |              |               |
|        |     seal     |              |              |               |
|        |     depth    |              |              |               |
|        |              |              |              |               |
|        | -   1/8\"    |              |              |               |
|        |     thru     |              |              |               |
|        |     barrier  |              |              |               |
|        |     gaps or  |              |              |               |
|        |     cracks   |              |              |               |
+--------+--------------+--------------+--------------+---------------+
| Sacri  | -   \< 10%   | -   10% to   | -   25% to   | -   No tested |
| ficial |     depth of |     25%      |     50%      |     or        |
| and    |     barrier  |     design   |     design   |     evaluated |
|        |     material |     depth of |     barrier  |     barrier   |
| non    |     removed  |     barrier  |     material |               |
| -sacri |     or never |     material |     depth    | configuration |
| ficial |              |     removed  |     over     |               |
|        |    installed |     or never |     area of  | -   50%       |
| board  |              |              |     6 sq.    |     required  |
| or     | -   Through  |    installed |     in.      |     barrier   |
| b      |     crack or |     over 6   |     Material |     depth     |
| lanket |              |     in area  |     removed  |     removed   |
|        |   equivalent |              |     or never |     or never  |
| (e.g., |     diameter | -   Through  |              |     installed |
| m      |     of ½\"   |     crack or |    installed |               |
| ineral |     or less  |              |              | -   Through   |
|        |              |   equivalent | -   Through  |     crack or  |
| wool   | -            |     diameter |     crack or |               |
| or     |  Compression |     of       |              |    equivalent |
| c      |     of       |     greater  |   equivalent |     diameter  |
| eramic |     material |     ½\" up   |     diameter |     greater   |
|        |              |     to 1\"   |     of       |     2\"       |
| fiber) |              |              |     greater  |               |
|        |              | -   Large    |     than 1\" |               |
|        |              |     metallic |     up to    |               |
|        |              |     cross    |     2\"      |               |
|        |              |     section  |              |               |
|        |              |     support  | -   Large    |               |
|        |              |     or large |     metallic |               |
|        |              |     cross    |     cross    |               |
|        |              |     section  |     section  |               |
|        |              |     cables   |     support  |               |
|        |              |     entering |     or large |               |
|        |              |     wrap     |     cross    |               |
|        |              |     without  |     section  |               |
|        |              |     2-6\" of |     cables   |               |
|        |              |     wrap     |     entering |               |
|        |              |              |     wrap     |               |
|        |              |              |     with     |               |
|        |              |              |     less     |               |
|        |              |              |     than 2\" |               |
|        |              |              |     of wrap  |               |
+--------+--------------+--------------+--------------+---------------+

+--------+--------------+--------------+--------------+---------------+
| *      |              |              |              |               |
| *Table |              |              |              |               |
| A2.2 - |              |              |              |               |
| Gu     |              |              |              |               |
| idance |              |              |              |               |
| for    |              |              |              |               |
| R      |              |              |              |               |
| anking |              |              |              |               |
| an     |              |              |              |               |
| Ob     |              |              |              |               |
| served |              |              |              |               |
| Fire   |              |              |              |               |
| B      |              |              |              |               |
| arrier |              |              |              |               |
| Degra  |              |              |              |               |
| dation |              |              |              |               |
| Fin    |              |              |              |               |
| ding** |              |              |              |               |
|        |              |              |              |               |
| *      |              |              |              |               |
| *Based |              |              |              |               |
| on the |              |              |              |               |
| Type   |              |              |              |               |
| of     |              |              |              |               |
| B      |              |              |              |               |
| arrier |              |              |              |               |
| System |              |              |              |               |
| A      |              |              |              |               |
| gainst |              |              |              |               |
| Which  |              |              |              |               |
| the    |              |              |              |               |
| Degra  |              |              |              |               |
| dation |              |              |              |               |
| Has    |              |              |              |               |
| Been   |              |              |              |               |
| N      |              |              |              |               |
| oted** |              |              |              |               |
+--------+--------------+--------------+--------------+---------------+
| **B    | **Cha        |              |              |               |
| arrier | racteristics |              |              |               |
| Type** | Associated   |              |              |               |
|        | with Each    |              |              |               |
|        | Degradation  |              |              |               |
|        | Level**      |              |              |               |
+--------+--------------+--------------+--------------+---------------+
|        | **Low**      | **Moderate   | **Moderate   | **High**      |
|        |              | A**          | B**          |               |
+--------+--------------+--------------+--------------+---------------+
| Unique | -   Severe   | -            | -            | -   No        |
| / Boot |     tears,   |              |              |     ceramic   |
|        |     loose    | -   Support  | -   2-3\" of |     fiber     |
| seals  |     bands,   |     missing  |     seal     |               |
|        |     open     |              |              |               |
|        |     bands,   |              |              |               |
|        |     outer    |              |              |               |
|        |     boot     |              |              |               |
|        |     missing  |              |              |               |
|        |              |              |              |               |
|        | -   Missing  |              |              |               |
|        |     boot     |              |              |               |
|        |     both     |              |              |               |
|        |     sides    |              |              |               |
+--------+--------------+--------------+--------------+---------------+
| Co     | -   Surface  | -   Greater  | -   Large    | -   Cracks    |
| ncrete |     cracks   |     than 30% |     surface  |               |
| and    |     \<       |     of       |     area     |    determined |
|        |     1/16\"   |     required |              |     to        |
| cement |     with no  |     concrete | deformations |     interfere |
| -based |              |     depth    |     (over    |     with      |
|        |   noticeable |     missing  |     50% of   |               |
| grout  |     depth    |              |     surface) |    structural |
| or     |              |              |     which    |     integrity |
|        |  penetration |              |     would    |               |
| penet  |              |              |     cause    | -   \<2       |
| ration | -   Through  |              |     higher   |     inches    |
| seal   |     cracks   |              |     heat     |     thick     |
|        |     smaller  |              |              |               |
| mat    |     than     |              |  absorptions |               |
| erials |     1/8\" in |              |              |               |
|        |     barrier  |              | -   \<4.5    |               |
|        |     that are |              |     inches   |               |
|        |     not more |              |     thick    |               |
|        |     than 50% |              |              |               |
|        |     of the   |              |              |               |
|        |     required |              |              |               |
|        |     barrier  |              |              |               |
|        |              |              |              |               |
|        |    thickness |              |              |               |
|        |              |              |              |               |
|        | -   1/16\"   |              |              |               |
|        |     thru     |              |              |               |
|        |     barrier  |              |              |               |
|        |     gaps or  |              |              |               |
|        |     cracks   |              |              |               |
+--------+--------------+--------------+--------------+---------------+
| Doors  | -   Improper | -   Small    | -   Multiple | -   Door      |
|        |     non      |     screw    |     holes in |     propped   |
|        | -combustible |     holes in |     door     |     open or   |
|        |     door     |     doors    |     surface  |     broken    |
|        |     labeling |     \<3/8\"  |     with     |     latch     |
|        |     material |     on both  |     greater  |               |
|        |              |     sides    |     than 1   |               |
|        | -   Several  |              |     inch     |               |
|        |     small    | -            |     opening  |               |
|        |     open     |   Improperly |              |               |
|        |     exposed  |              | -   Door     |               |
|        |     holes in |    installed |     latch    |               |
|        |     doors,   |     fire     |     not      |               |
|        |     door gap |     door     |              |               |
|        |     issues   |     hardware |   functional |               |
|        |     not      |     (other   |              |               |
|        |              |     than     | -   Latch    |               |
|        |    exceeding |     latch)   |              |               |
|        |     25% of   |              |   engagement |               |
|        |     man      | -   Bent or  |     \<1/2    |               |
|        | ufacturer\'s |     warped   |     inch     |               |
|        |              |     fire     |              |               |
|        |  recommended |     door     |              |               |
|        |     sp       |     with     |              |               |
|        | ecifications |     gaps     |              |               |
|        |     or up to |     less     |              |               |
|        |     3/8\"    |     than 1   |              |               |
|        |     gap      |     inch     |              |               |
|        |              |              |              |               |
|        | -   Multiple | -   Fire     |              |               |
|        |     holes in |     door to  |              |               |
|        |     door on  |     frame or |              |               |
|        |     one side |     floor    |              |               |
|        |     of a     |              |              |               |
|        |     door     |    clearance |              |               |
|        |     surface  |     gaps up  |              |               |
|        |     with     |     to 1     |              |               |
|        |     less     |     inch     |              |               |
|        |     than     |              |              |               |
|        |     1/8\"    |              |              |               |
|        |     inch     |              |              |               |
|        |     opening  |              |              |               |
|        |              |              |              |               |
|        | -   Door     |              |              |               |
|        |     frames   |              |              |               |
|        |     with     |              |              |               |
|        |     greater  |              |              |               |
|        |     than     |              |              |               |
|        |     1/8\"    |              |              |               |
|        |     thru gap |              |              |               |
+--------+--------------+--------------+--------------+---------------+

+--------+--------------+--------------+--------------+---------------+
| *      |              |              |              |               |
| *Table |              |              |              |               |
| A2.2 - |              |              |              |               |
| Gu     |              |              |              |               |
| idance |              |              |              |               |
| for    |              |              |              |               |
| R      |              |              |              |               |
| anking |              |              |              |               |
| an     |              |              |              |               |
| Ob     |              |              |              |               |
| served |              |              |              |               |
| Fire   |              |              |              |               |
| B      |              |              |              |               |
| arrier |              |              |              |               |
| Degra  |              |              |              |               |
| dation |              |              |              |               |
| Fin    |              |              |              |               |
| ding** |              |              |              |               |
|        |              |              |              |               |
| *      |              |              |              |               |
| *Based |              |              |              |               |
| on the |              |              |              |               |
| Type   |              |              |              |               |
| of     |              |              |              |               |
| B      |              |              |              |               |
| arrier |              |              |              |               |
| System |              |              |              |               |
| A      |              |              |              |               |
| gainst |              |              |              |               |
| Which  |              |              |              |               |
| the    |              |              |              |               |
| Degra  |              |              |              |               |
| dation |              |              |              |               |
| Has    |              |              |              |               |
| Been   |              |              |              |               |
| N      |              |              |              |               |
| oted** |              |              |              |               |
+--------+--------------+--------------+--------------+---------------+
| **B    | **Cha        |              |              |               |
| arrier | racteristics |              |              |               |
| Type** | Associated   |              |              |               |
|        | with Each    |              |              |               |
|        | Degradation  |              |              |               |
|        | Level**      |              |              |               |
+--------+--------------+--------------+--------------+---------------+
|        | **Low**      | **Moderate   | **Moderate   | **High**      |
|        |              | A**          | B**          |               |
+--------+--------------+--------------+--------------+---------------+
| D      | -   Damper   | -   Damper   | -   Damper   | -   Damper    |
| ampers |     not in   |     will     |     will     |     sealing   |
|        |              |     close    |     close    |     less than |
|        |  maintenance |     greater  |     \>90%    |     or equal  |
|        |              |     than     |              |     to 90%,   |
|        |   inspection |     95%,     | -   No       |     will not  |
|        |     program  |              |     damper   |     close     |
|        |              |  Temperature |     at fire  |               |
|        | -   Damper   |     of       |     barrier  | -   Broken    |
|        |     frames   |     fusible  |     in steel |     latch     |
|        |     with     |     link     |     duct     |     (where    |
|        |     greater  |              |     work     |     latch     |
|        |     than     |  excessively |              |     required  |
|        |     3/8\"    |     high or  | -   Damper   |     for       |
|        |     thru gap |     fusible  |     is not   |     closure)  |
|        |              |     link     |     rated to |               |
|        | -   Damper   |              |     close    | -   No damper |
|        |     can      |   improperly |     against  |     installed |
|        |     close    |              |              |               |
|        |              |    installed |  anticipated |               |
|        |   completely |              |              |               |
|        |              |              |  ventilation |               |
+--------+--------------+--------------+--------------+---------------+
| Un     | -   Conduits | -   Conduits | -   Conduits |               |
| sealed |     smaller  |     \> 4     |     \> 4     |               |
|        |     than 1   |     Inch     |     Inch     |               |
| co     |     inch     |     with     |     with     |               |
| nduits |     with 3   |     greater  |     less     |               |
|        |     feet on  |     than 5   |     than 5   |               |
|        |     each     |     feet on  |     feet on  |               |
|        |     side of  |     each     |     each     |               |
|        |     barrier  |     side of  |     side of  |               |
|        |              |     barrier  |     barrier  |               |
|        |              |     or \>2   |     or \>2   |               |
|        |              |     Inch     |     Inch     |               |
|        |              |     with     |     with     |               |
|        |              |     greater  |     less     |               |
|        |              |     than 3   |     than 3   |               |
|        |              |     feet on  |     feet on  |               |
|        |              |     each     |     each     |               |
|        |              |     side of  |     side of  |               |
|        |              |     barrier  |     barrier  |               |
+--------+--------------+--------------+--------------+---------------+

**[Water Curtain:]{.underline}**

-   **Low** degradation - Less than 10% of heads obstructed or fouled,
    and no adjacent heads fouled.

-   **Moderate** degradation - Not applicable.

-   **High** degradation - Greater than 10% of heads obstructed or
    fouled or two adjacent heads fouled or obstructed. System
    nonfunctional.

    **[Radiant Energy Shields:]{.underline}**

Note: If the radiant energy shield is a 'Rated' barrier (Darmatt,
Interram), use the appropriate

barrier type from elsewhere in this table.

-   **Low** degradation:

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```
-   Barrier completely obstructs line of sight between the target of
    interest and potential fire sources that could affect redundant
    targets, and it is non-combustible.

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```
-   **Moderate** degradation:

```{=html}
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```
-   Barrier provides partial line of sight obstruction between target of
    interest and potential fire sources that could affect redundant
    targets, or

-   It is combustible, but of rated material (Thermo-Lag).

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```
-   **High** degradation:

```{=html}
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```
-   Barrier does not provide line of sight obstruction between target of
    interest and potential fire sources that could affect redundant
    targets, or

-   It is combustible and not made of a rated material.

    **SAFE SHUTDOWN FINDINGS**

Safe shutdown findings are related to degradations in operational
aspects of post fire safe shutdown such as manual actions, analysis of
associated circuits, analysis of required circuits, spurious operation,
alternate shutdown, fire response procedures, the post-fire safe
shutdown analysis, etc.

The safe shutdown finding category is not intended to cover findings
against physical protection of the designated safe shutdown path such as
passive fire barriers, fire detection, and fire suppression. Findings
against physical protection features are covered under other finding
categories.

For findings related to the licensee's post-fire SSD program, three
levels of degradation have been defined with examples as follows:

+-----------------+----------------------------------------------------+
| Number range    |                                                    |
| CHAPTER**Table  |                                                    |
| A2.3 - Guidance |                                                    |
| for Ranking an  |                                                    |
| Observed SSD    |                                                    |
| Degradation     |                                                    |
| Finding**       |                                                    |
+-----------------+----------------------------------------------------+
| *               | **Examples**                                       |
| *Quantification |                                                    |
| Rank**          |                                                    |
+-----------------+----------------------------------------------------+
| **Low**         | -   Typographical procedure errors, where the      |
|                 |     intent is clear or can be easily inferred from |
|                 |     the procedures context                         |
|                 |                                                    |
|                 | -   Minor procedural deficiencies that are         |
|                 |     compensated by operator experience/familiarity |
+-----------------+----------------------------------------------------+
| **Moderate**    | -   Procedural inconsistencies between EOPs and    |
|                 |     Fire SSD procedures                            |
|                 |                                                    |
|                 | -   Equipment or tools not staged or located as    |
|                 |     specified by procedures                        |
|                 |                                                    |
|                 | -   Operator training on fire SSD procedures       |
|                 |     incomplete                                     |
|                 |                                                    |
|                 | -   Feasibility to perform specified manual        |
|                 |     actions with available staff is not apparent   |
+-----------------+----------------------------------------------------+
| **High**        | -   Post-fire SSD analysis is incomplete           |
|                 |                                                    |
|                 | -   Locations for actions required in SSD          |
|                 |     procedures are in environmentally challenging  |
|                 |     areas (e.g., low or high temperatures, high    |
|                 |     humidity)                                      |
|                 |                                                    |
|                 | -   Plant conditions cannot be assessed or readily |
|                 |     inferred from information available to the     |
|                 |     operators or as addressed in Fire SSD or EOP   |
|                 |     procedures                                     |
|                 |                                                    |
|                 | -   Plant design or component design severely      |
|                 |     impacts operator performance of SSD operations |
|                 |                                                    |
|                 | -   Lack of alternate shutdown procedure           |
+-----------------+----------------------------------------------------+

Intentionally Blank

[^1]: Safe conditions were obtained from list of conditions in
    subsection 3-3.2 in NFPA 51B,

    "Standard for Fire Prevention During Welding, Cutting, and Other Hot
    Work," 1999.