ML20044H317
| ML20044H317 | |
| Person / Time | |
|---|---|
| Site: | Millstone  |
| Issue date: | 06/02/1993 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML20044H314 | List: |
| References | |
| RTR-REGGD-01.097, RTR-REGGD-1.097 NUDOCS 9306080176 | |
| Download: ML20044H317 (2) | |
Text
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WASHINGTON, D.C. 20555 0001 SAFETY EVALUATION BY THE OFFICE OF NUCLEAR REACTOR REGULATION MILLSTONE NUCLEAR POWER STATION. UNIT 2 CONFORMANCE TO REGULATORY GUIDE 1.97. REVISION 2 NORTHEAST NUCLEAR ENERGY COMPANY DOCKET N0. 50-336
1.0 INTRODUCTION
l By letter dated May 22, 1991, (Reference 1), Northeast Nuclear Energy Company l
(NNECO) proposed to change classification of certain Post Accident Monitoring Instrumentation. The proposed change includes five plant specific Type A variables reclassified to other types, as defined in Regulatory Guide (RG) 1.97, and one Type D variable that would be reclassified to Type A.
NNEC0's submittal of March 2,1992, (Reference 2), lists these variables with the new l
classification.
2.0 EVALUATION Type A variables are plant specific and as such, are not listed in RG 1.97.
These variables provide primary information for specified manually controlled actions for which no automatic control is provided.
Types B, C, D and E variables listed in RG 1.97 are used for indication, and design and qualification criteria for each of these instruments is provided in regulatory position 1.3 and 1.4 of RG 1.97.
NNECO has proposed to remove five variables (Pressurizer Level, Cold leg Temperature, Auxiliary Feedwater Flow, Degrees of Subcooling, Containment Radiation) from the Type A list, because these variables are not used for manually controlled actions for which no automatic control is provided and therefore, this instrumentation does not need to be qualified to Category 1 requirements. Our review indicates that each of these five variables has been correctly identified by the licensee.
The Refueling Water Storage Tank (RWST) level instrumentation was changed to Type A from Type D because some specific operator actions are required by the plant Emergency Operating Procedure for RWST level during and after a design basis event.
The RWST level instrumentation is qualified to Category 1 requirements.
3.0 CONCLUSION
Based on the above evaluation, we conclude that NNEC0's subject proposal to change the classification of certain variables for Post Accident Monitoring is acceptable.
9306080176 930602 PDR ADOCK 05000336 P
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4.0 REFERENCES
1.
NNECO (C.F. Sears) to NRC (document control) dated May 22, 1991.
2.
NNECO (J.F. Opeka) to NRC (document control) dated March 2, 1992.
Principal Contributor:
- 1. Ahmed Date:
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