ML20057A338
| ML20057A338 | |
| Person / Time | |
|---|---|
| Site: | Surry  |
| Issue date: | 09/01/1993 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML20057A337 | List: |
| References | |
| NUDOCS 9309140035 | |
| Download: ML20057A338 (3) | |
Text
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UNITED STATES NUCLEAR REGULATORY COMMISSION g ss j/
WASHINGTON. D.C. 20555-0001 l
SAFETY EVALUATION BY THE OFFICF 0F NUCLEAR REACTOR REGULATION i
RELATED TO AMENDMENT NO.182 TO FACILITY OPERATING LICENSE NO. OPR-32 AND AMENDMENT NO.182 TO FACILITY OPERATING LICENSE NO. DPR-37 I
l VIRGINIA ELECTRIC AND POWER COMPANY
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SURRY POWER STATION. UNITS 1 AND 2 i
DOCKET NOS. 50-280 AND 50-281 l
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1.0 INTRODUCTION
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l By letters dated March 15, 1993 and April 21, 1993, the Virginia Electric and l
Power Company (the licensee) proposed changes to the Technical Specifications (TE) for the Surry Power Station, Units 1 and 2.
The changes would (1) eliminate specific Main Control Room (MCR) and Emergency Switchgear Room l
(ESGR) air conditioning chiller identification from the TS, (2) specify a time l
limit to restore one of two inoperable chillers to operable status, when two l
of three chillers become inoperable, prior to shutting down both units, and l
(3) revise the Basis section to delete the fire watch in the ESGRs, discuss l
the configuration and operation of the MCR and ESGR air conditioning system i
with the two new safety-related chillers, and reflect the new power scheme of i
l the five control room chillers and associated chilled water pumps.
In I
addition, system names and TS defined words are being capitalized and acronyms are being spelled out for consistency.
2.0 PROPOSED TECHNICAL SPECIFICATION CHANGES The Basis section of TS 3.16 is being revised to add one additional water j
chilling unit and one additional chilled water circulating pump to the list of l
engineered safeguards equipment powered from each emergency bus.
TS 3.23.C.1.a is being revised by replacing the specific reference to chillers 1-VS-E-4A, 48, and 4C with the more general reference "three Main Control Room and Emergency Switchgear Room chillers".
l TS 3.23.C.I.b is being added to require that three operable chillers are to be j
powered from three of the four emergency buses with one of those chillers capable of being powered from the fourth emergency bus.
TS 3.23.C.I.c (formally TS 3.23.C.I.b) is being revised to include the requirements of the new TS 3.23.C.I.b.
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t 9309140035 930901 DR ADOCK 05000280 PDR
2 TS 3.23.C.l.d is being added to provide an action statement requiring that if two of the operable chillers become inoperable or not powered as described in the new TS 3.23.C.l.b, an inoperable chiller must be returned to operable I
status within 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> or bring both units to hot shutdown within the next 6
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hours and be in cold shutdown within the following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />.
The footnote associated with TS 3.23.C.2.a.1 and TS 3.23.C.2.a.2, which provided for planned entry into these action statements during the MCR and i
ESGR air conditioning system upgrade project, is being deleted.
The Basis section of TS 3.23 is being revised to add a discussion of the configuration and operation of the MCR and ESGR air conditioning system with the two new safety-related chillers and to delete the requirement of a fire i
watch in both ESGRs.
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In addition, administrative changes are being made to capitalize TS defined words throughout TS section 3.23 and to spell out acronyms and capitalize system names for consistency.
3.0 EVALUATION
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This TS revision is part of the Surry Power Station initiated MCR and ESGR air conditioning system upgrade program which was started in 1988.
To complete i
the upgrade program, the existing interim operating restrictions must be j
revised to permit the use of two new safety-related chillers to meet the i
operability requirements and complete the final plant modifications.
i The interim operating restrictions on the Air Handling Units (AHUs) have been
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removed from the TS.
The AHUs have been replaced with larger capacity units i
which return the air handling capacity of the two trains to 100% capacity each, which was the original plant design requirement.
As a result of this work, the need for a fire watch in the ESGRs has been eliminated.
Work on the additional chiller capacity is continuing; therefore, the requirements for the interim operating restrictions for the chillers and the mechanical equipment room #3 firewatch are still necessary.
These TS changes will continue to provide 100% air conditioning system capacity to support plant operations.
The revised TS will continue to require l
three operable chillers, powered from three of the four emergency buses with one of the chillers capable of being powered from the fourth emergency bus, whenever either unit is above cold shutdown. This requirement meets the single failure requirements and provides heat removal capacity during both normal and accident conditions.
l Operation of the MCR and ESGR air conditioning system following these j
modifications continues to ensure adequate cooling capacity for normal and accident conditions.
Equipment redundancy prevents a total loss of air conditioning during any single failure.
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4.0
SUMMARY
The staff has reviewed the licensee's proposed changes to TS Sections 3.16 and 3.23 and finds them to be acceptable, i
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5.0 STATE CONSULTATION
In accordance with the Commission's regulations, the Virginia State official was notified of the proposed issuance of the amendments.
The State official had no comment.
6.0 ENVIRONMENTAL CONSIDERATION
i These amendments change a requirement with respect to installation or use of a facility component located within the restricted area as defined in 10 CFR t
l Part 20. The NRC staff has determined that the amendments involve no significant increase in the amounts, and no significant change in the types, of any effluents that may be released offsite, and that there is no significant increase in individual or cumulative occupational radiation l
exposure. The Commission has previously issued a proposed finding that these amendments involve no significant hazards consideration and there has been no public comment on such finding (58 FR 39060).
The staff's proposed finding of no significant hazards consideration is not affected by the April 21, 1993 supplement. Accordingly, these amendments meet 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 l
l prepared in connection with the issuance of these amendments.
7.0 C_0NCLUS10N 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, i
and (3) the issuance of these amendments will not be inimical to the common defense and security or to the health and safety of the public.
j Principal Contributor:
T. Farnholtz j
Date: Septe:aber 1,1993
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