ML20133B458
| ML20133B458 | |
| Person / Time | |
|---|---|
| Site: | Salem  |
| Issue date: | 12/12/1996 |
| From: | NRC (Affiliation Not Assigned) |
| To: | |
| Shared Package | |
| ML20133B453 | List: |
| References | |
| NUDOCS 9701030193 | |
| Download: ML20133B458 (2) | |
Text
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UNITED STATES j
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NUCLEAR REGULATORY COMMISSION WASHINGTON. D.C. 2006H001 J
SAFETY EVALUATION BY THE OFFICE OF NUCLEAR REACTOR REGULATION RELATED TO AMENDMENT NO.168TO FACILITY OPERATING LICENSE NO. DPR-75 PUBLIC SERVICE ELECTRIC & GAS COMPANY PHILADELPHIA ELECTRIC COMPANY DELMARVA POWER AND LIGHT COMPANY ATLANTIC CITY ELECTRIC COMPANY SALEM NUCLEAR GENERATING STATION. UNIT NO. 2 1
DOCKET NO. 50-311 2
1.0 INTRODUCTION
By letter dated September 20, 1996, as supplemented September 30, 1990, the Public Service Electric & Gas Company (the licensee) submitted a request for changes to the Salem Nuclear Generating Station, Unit No. 2, Technical Specifications (TSs). The requested changes would revise TS Surveillance Requirement (SR) 4.7.7.b.4 and its associated basis to indicate that the specified flowrate for the Auxiliary Building Exhaust Air Filtration System a
applies only to system testing.
2.0 EVALUATION The Auxiliary Building ventilation system controls the release of re.dioactive f
iodine to the environment following a loss of Coolant Accident (LOCA).
Contaminated coolant is drawn from the containment sump by the Residual Heat Removal pumps and supplied to other Emergency Core Cooling System (ECCS) equipment for return to the Reactor Coolant System during the post-LOCA recirculation phtse.
Leakage from valve packing and pump seals may result in the spread of c a tamination to the Auxiliary Building and potentially to the external enstronment.
Flow from the ECCS equipment areas is processed through the charcoal adsorber to remove radio-iodine released to the building atmosphere prior to its release to the environment through the plant vent. A flowrate of 21,400 cfm i10% is required during testing to assure that the HEPA + Charcoal filtration train is challenged at design basis flowrates during filter capability testing.
The existing TS SR 4.7.7.b.4 requires verification of a system flowrate of 21,400 cfm i 10% "during system operation." This could be interpreted to imply that the system operates at a flowrate of 21,400 cfm i 10% at all times.
However, as explained in Salem Updated Final Safety Analysis Report Section 9701030193 961212 PDR ADOCK 05000311 P
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g.4.2.2.2, the system flowrate modulates between 2/3 and full capacity depending on external temperature. Thus, at times the flowrate is lower than that in the TS. The lower flowrate results in a longer residence time of the i
radio-iodine passing through the charcoal bed and, therefore, a higher j
removal efficiency of the charcoal filter. Thus, lower flowrates are acceptable and' conservative.
1 To demonstrate o>erability of the HEPA + Charcoal train, the highest system flowrate should >e used since it results in the shortest residence time and the lowest removal efficiency.
Therefore, the system flowrate of 21,400 cfm +
10%, or 23,540 cfs, which is the maximum design flowrate, is the appropriate 1
value for TS 4.7.7.b.4.
The staff agrees that the maximum design flowrate is i
the appropriate value for testing the system and therefore, concludes that the change to TS 4.7.7.b.4 and the associated change to the TS Bases are j
acceptable.
3.0 STATE CONSULTATION
i In accordance with the Commission's regulations, the New Jersey State official l
was notified of the proposed issuance of the amendment. The State official had no comments.
4.0 ENVIRONMENTAL CONSIDERATION
The amendment changes the surveillance requirements.
The NRC staff has determined that the amendment involves no significant increase in the amounts, and no significant change in the types, of any effluents that may be released i
offsite, and that there is no significant increase in individual or cumulative occupational radiation exposure.
The Commission has previously issued a proposed finding that the amendment involves no significant hazards consideration, and there has been no public comment on such finding (61 FR j
55040). Accordingly, the amendment meets the eligibility criteria for categorical exclusion set forth in 10 CFR 51.22(c)(9).
Pursuant to 10 CFR 51.22(b) no environmental impact statement or environmental assessment need be prepared in connection with the issuance of the amendment.
5.0 CONCLUSION
The Commission has concluded, based on the considerations discussed above, that:
(1) there is reasonable assurance that the health and safety of the public will not be endangered by operation in the proposed manner, (2) such activities will be conducted in compliance with the Commission's regulations, and (3) the issuance of the amendment will not be inimical to the. common defense and security or to the health and safety of the public.
Principal Contributor:
L. 01shan Date: December 12, 1996
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