ML20212K434
| ML20212K434 | |
| Person / Time | |
|---|---|
| Site: | LaSalle  |
| Issue date: | 02/24/1987 |
| From: | Farrar D COMMONWEALTH EDISON CO. |
| To: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| 2761K, NUDOCS 8703090307 | |
| Download: ML20212K434 (2) | |
Text
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ConUnonwealth Edloon c'
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'7 One First Nabonal Plaza, Chca00, Illinois
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Address Reply to: Post Omce Box 767 Chicago. Illinois 60690 0767 February 24, 1987 Mr. James G. Keppler Regional Administrator U.S. Nuclear Regulatory Commission Region III 799 Roosevelt Road Glen Ellyn, IL 60137
Subject:
LaSalle County Station Units 1 and 2 Response to Inspection Report Nos.
50-373/86040 and 50-374/86040 NRC Docket Nos. 50-373 and 50-374 References (a):
C. E. Norelius letter to Cordell Reed dated December 2, 1986.
(b):
C. E. Norelius letter to Cordell Reed dated January 21, 1987.
Dear Mr. Keppler:
This letter is in response to the inspection conducted by Messrs.
M. Jordan, R. Kopriva, J. Mueller and D. Butler of activities at LaSalle County Station. Reference (a) indicated that certain activities appeared to be in noncompliance with NRC requirements. The Commonwealth Edison Company response to the item in the Notice of Violation (Reference (b)) is provided in the Attachment. An extension until February 27, 1987 was granted in a telecon between C. M. Allen and M. Ring of your staff.
If you have any further questions on this matter, please direct them to this office.
Very uly yours, 4
a e-m__ -
D. L. Farrar Director of Nuclear Licensing Im I
Attachment cc: NRC Resident Inspector - LSCS 8703090307 870224 2761K PDR ADOCK 05000373 G
PDR FEB 24 E87
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VIOLATION - IR 50-374/86040-03 Technical Specification 3.3.2.b requires that the isolation actuation instrumentation channels shown in table 3.3.2-1 be operable or the action taken required by the Limiting Condition for Operation (LCO) which is, "With the number of OPERABLE channels less than required by the minimum OPERABLE channels per trip system requirements for one trip system, place the operable channel (s) and/or trip system in the tripped condition
- within one hour." A foot note at the bottom of the page states, "*An inoperable 4
channel need not be placed in the tripped condition where this would cause the trip function to occur.
In these cases, the inoperable, channel shall be restored to OPERABLE status within 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> or the ACTION required by table 3.3.2-1 for that trip functions shall be taken."
Table 3.3.2-1 lists " Action 25" for the Reactor Vessel (Residual Heat Removal (RHR) Cut-In Permissive Pressure-High).
" Action 25" states,
" Lock the affected system isolation valves closed within 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> and declare the affected system inoperable".
Contrary to the above, on October 16, 1986, at 12:35 a.m., the Reactor Vessel (RHR Cut-In Permissive Pressure-High) did not have the minimum operable channels per trip system until 10:50 p.m. on October 16, l
1986, and the affected system isolation valves'were not locked closed within the allowed LCO time limit, i
CORRECTIVE ACTION TAKEN AND RESULTS ACHIEVED Upon determination that the pressure switch was not OPERABLE due to the closed isolation valve, the Instrument Maintenance Technicians proceeded 1
to return the instrument to OPERABLE status. This action was completed within the 2 hcurs allowed by Technical Specification 3.3.2.b.
CORRECTIVE ACTION TAKEN TO AVOID FURTHER VIOLATION The LCO requirement (locking shut the isolation valves) was not complied with because personnel were unaware that the switch was not OPERABLE. After the problem was discovered, corrective action was taken in accordance with the Technical Specifications to return the switch to OPENABLE before it became mandatory to lock the valves shut.
The problems which led to this condition, failure of second verification and monitoring of plant status, are separate violations (373/86040-01(DRP) and 373/86040-02(DRP)). Details of the corrective actions for these areas will be supplied as part of the responses to those violations.
DATE OF FULL COMPLIANCR i
Full compliance has been achieved.
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2761K i.
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