Document: NUREG-0800
Document ID: 7205f369-90a8-45ce-8b98-8c5831c9ff41
Document Type: srp
Title: Revision 3 - March 2007
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0707/ML070710497.pdf
Revision Date: 2023-06
Chapter: 8
Section ID: 8
CFR Part: 
CFR Title: 

Content:
xpected to occur more frequently than once per year and can render the unit unavailable to adequately respond to an automatic or operator-initiated emergency demand. Manually induced indication may be desirable and is permitted for diesel-generator unit bypass or deliberately induced inoperability status for those conditions expected to occur less frequently than once per year. 2. All status indication should be sufficiently precise to prevent misinterpretation. Furthermore, disabling or bypass indicators should be separate from nondisabling indicators and should be physically arranged to enable the operator to clearly determine the status of each diesel-generator unit. An acceptable design includes a separate alarm for each disabling condition or a single shared alarm with reflash capability. The alarms should be displayed in the control room and at the diesel-generator unit for all disabling conditions, with wording that indicates that the diesel-generator unit is incapable of adequately responding to an emergency demand. 3. When a shared diesel-generator unit can be bypassed, indication of that bypass condition should be provided in the control room of each affected unit. 4. The indication system should be designed and installed to preclude the possibility of adverse effects on the diesel-generator units. Failures in the indication equipment should not result in diesel-generator unit failure or bypass of the diesel-generator unit, and the bypass indication should not reduce the required independence between redundant diesel-generator units. 5. The indication system should be capable of ensuring its operable status during normal plant operation to the extent that the indicating and annunciating function can be verified. 6. RG 1.9, positions C.1.6 through C.1.8, contains further guidance to be addressed regarding status and anomalous conditions indication and alarms for diesel-generators. BTP 8-7-3 Revision 3 - March 2007 C. REFERENCES 1. Regulatory Guide 1.9,