ML20126D903
| ML20126D903 | |
| Person / Time | |
|---|---|
| Site: | North Anna  |
| Issue date: | 12/09/1992 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML20126D882 | List: |
| References | |
| NUDOCS 9212280216 | |
| Download: ML20126D903 (4) | |
Text
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SAFETY EVALUATION BY THE OFFICE OF' NUCLEAR REACTOR REGULAT10ti MLATED TO AMENDMENT NOS.169 AND 148 -TO FACILITY OPERATING LICENSE N05. NPF-4 AND NPF-7 11EGINIA ELECTRIC AN0' POWER COMPANY OLD DOMINION ELECTRIC COOPERATIVE NORTH ANNA POWER STATION. UNITS NO. l'AND NO. 2 DOCKET NOS. 50-338 AND 50-339
1.0 INTRODUCTION
By letter dated September 4,1992, the Virginia Electric and Power Company-(the licensee) proposed changes to the Technical Specifications-(TS) for the North Anna Power Station, Units No I and No. 2 (NA-l&2).
The proposed changes would revise the current TS pertaining to the monitoring program for secondary water chemistry. The proposed changes would delete TS 6.8.4.c(vii).
Also, TS 6.8.4.c(iii) would be modified to reflect the deletion of TS 6.8.4.c (vil).
Finally, editorial changes would be made to TSs 6.8.4.c(v) and-6.8.4.c(vi).
2.0- DISCUSSION TS 6.8.4.c(vii) was a condition established for obtaining the full power license for NA-2. ~ TS 6.8.4.c(vii) was. implement _ed in licensee amendment No. 32 for NA-1.
The NRC decision to require =the licensee to establish monitoring and repair of condenser inleakage is discussed in NUREG-0053, Supplement 10, Safety Evaluation Report-for the' North. Anna' Power Station.
NUREG-0053 states:-
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"... we require monitoring of-the steam condensate at the effluent of the
= condensate pump. When condenser leakage is confirmed the. applicant will be required to repair or plug the leak in accordance with MTEB Branch Technical Position MTEB 5-3 attached to Standard Review Plan 5.4.2.1."
MTEB 5-3 describes the suggested secondary water chemistry program in order to maintain steam generator integrity. -'MTEB 5-3,, dated July 1981, states 1the following:
"ll.3.f.(1)(f) When a condenser leak Lis-confirmed, the leak should be.
repaired or plugged within 96 hours0.00111 days <br />0.0267 hours <br />1.587302e-4 weeks <br />3.6528e-5 months <br />, or before the total. integrated conductivity-increase reaches 20 pmho/cm hrs. The staff will consider 9212280216 921209 I
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. other impurity-time limit proposals for limiting the quantity of impurities entering the steam generator."
Steam Generator Owners Group (SG0G) and Electric. Power Research Institute (EpRI) guidelines were established in February 1985 and December 1988, respectively.
These guidelines have been established as industry accepted standards and are more stringent than the MIEB 5-3 position with regard to establishing actions for confirmation and repair of condenser inleakage. MTEB 5-3 places primary emphasis on condenser inleakage. The SG0G and EPRI guidelines place primary emphasis on steam generator chemistry specifications to ensure secondary water chemistry is maintained at conditions to prevent steam generator corrosion.
3.0 Technical Specification Chanaes The proposed changes would modify TS 6.8.4.c.(ill) and delete TS 6,8.4.c.(vii).
TS 6.8.4.c(lii) and (vii) presently state the following:
"C. Secondary Water Chemistry A program for monitoring of secondary water chemistry to inhibit steam generator tube degradation.
This program shall include:
(iii) Identification of process sampling points, (vii) Monitoring of the condensate at the discharge of the condensate pumps for evidence of condenser inleakage. When condenser inleakage is confirmed, the leak shall be repaired, plugged, or isolated within 96-hours."
The revised Technical Specification 6.8.4.c(iii) will read as follows:
(iii) Identification of process sampling points, which shall include monitoring the discharge of the condensate pumps for evidence-of condenser inleakage,"
The purpose of the revised TS 6.8.4.c(iii) would be to incorporate the
. requirements that were in TS-6.8.4.c(vil)-for monitoring of condenser inleakage.
These. changes [ deletion of TS 6.8.4.c(vii),- and modification of TS_6.8.4.c(iii)] are consistent with the SGOG and-EPRI guidelines and will continue to ensure that the condensate at the discharge of the condensate pumps will be monitored in order to detect condenser inleakage.
The.SGOG and EPRI guidelines have established appropriate action levels to be entered when a chemistry parameter is not maintained.
For example, the normal 4
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l value for condenser inleakage is less than four cubic feet per minute (cfm) inleakage.
If condenser inleakage exceeds four cfm, action level one is entered into to promptly identify and correct the cause of the out of normal value without power reduction.
The specific action required is to return condenser inleakage to within the normal value within one week.
- However, condenser inleakage outside normal values will cause other secondary water chemistry parameters to be outside their specified limits. Appr opriate actions to maintain other secondary water chemistry parameters within specified limits may include such actions as reducing power or a plant shutdown. NA-l&2 have incorporated chemistry parameter action levels into station administrative procedures.
These action levels ensure a more conservative approach than MTEB 5-3 for condenser inleakage.
This will replace, in part, TS 6.8.4.c(vii), that discussed the action time associated with confirmation of condenser inleakage.
in addition, minor editorial changes are proposed to TS 6.8.4.c(v) and 6.8.4.c(vi).
Finally, the proposed changes are consistent with the SGOG guidelines, EPRI guidelines, and NUREG-0452, Revision 4, Standard Technical Specifications for Westinghouse Pressurized Water Reactors.
4.0 EVALUATION The proposed changes are consistent with the SGOG and EPRI guidelines and applicable sections of NUREG-0452.
These changes would ensure that the condensate at the discharge of the condensate pumps will be monitored in order to detect condenser inleakage. Also, station administrative procedures will ensure appropriate actions are taken in the event of condenser leakage.
These station procedures ensure an aggressive approach for condenser inleakage by evaluating all chemistry parameters that may be affected and the entering of any applicable action level for any chemistry parameter that may be associated with an increased condenser inleakage.
Finally, the proposed changes are more conservative than the current NA-l&2 TS.
Based on all of the above, the staff finds the proposed changes to be acceptable.
5.0 STATE CONSULTATIQN In accordance with the Comission's regulations, the Virginia State official was notified of the proposed issuance of the amendment.
The State official had no comment.
6.0 WVIRONMENTAL CONSIDERATION These amendments relate to changes in recordkeeping, reporting, or administrative procedures or requirements. Accordingly, these amendments meet the eligibility criteria for categorical exclusion set forth in 10 CFR 51.22(c)(10).
Pursuant to 10 CFR 51.22(b) no environmental impact statement or environmental assessment need be prepared in connection with the issuance of the amendments.
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7.0 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 amendments will not be 171mical to the common defense and security or to the health and safety of the public, Principal Contributor:
Leon B. Engle Date: December 9, 1992 1
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