ML20151B148

Confirms 880711 Telcon & Revises CAL-RIII-88-17 Re Resolution of Back Leakage Through Auxiliary Feedwater. Understands Util Will Follow Listed Procedures,Including Checking of Casing Temps of Auxiliary Feedwater Pumps

ML20151B148
Person / Time
Site:	Zion File:ZionSolutions icon.png
Issue date:	07/12/1988
From:	Davis A NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
To:	Reed C COMMONWEALTH EDISON CO.
References
CAL-RIII-88-17, NUDOCS 8807200261
Download: ML20151B148 (2)

Text

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e CONFIRMATORY ACTION LETTER W

N JUL 12 1998 CAL-RIII-88-017-1 EA 88-190 Docket No. 50-304 Comonwealth Edison Company ATTN: Mr. Cordell Reed Senior Vice President Post Office Box 767 Chicago, IL 60690 Gentlemen:

This letter confims the telephone conversation between E. G. Greenman of this office and T. J. Maiman on July 11, 1988, and revised CAL-RIII-88-017 dated June 30, 1988, related to your resolution of back leakage through Auxiliary Feedwater (AFW) check valves as evidenced by elevated motor driven AFW pump casing temperatures, for the 28 and 2C AFW pumia at Zion Unit 2.

With regard to this matter we understand that you will:

1. Check the casing temperatures of 2B and 2C AFW pumps, N their [R associated discharge valve is open, on an hourly basit c:>ing a .R contact pyrometer, or contact themoccuples with a stri; chart recorder. Report any trend to the Zion NRC Resident In:pector.

2. In the event that the casing temperatures of 2B or 2C AFW pumps reach or exceed 150*F, the pump casing will be cooled to within 25*F of 3R condensate water temperature by using the casing vent valves and/or the pump started using an approved Zion Unit 2 procedure to equalize the casing temperature.

3.

Complete a walkdown of the affected AFW piping systems inspecting for evidence of pipe hanger, penetrations, equipment anchor or other physical or thermal damage and irTnediately perfom a safety analysis, of any damage identified, for system operability. Additionally, during this walkdown detemine the temperature gradient, as achievable, of the piping down to 200*F from valve 2FW0069. Upon completion, report the results to the Zion NRC Resident Inspector. In the event of gas formation, pump binding or water hamer indications, subsequent to the initial walkdown, an additional system walkdown and appropriate analysis shall be perfonred and reported to the Zion NRC Resident Inspector.

4. Complete a safety analysis of possible thermal stress affects on the affected AFW systems and components for system operability including the thermal cycles and number of pump starts since the last startup. Upon completion, report the results to the Zion NRC Resident Inspector.

5.

Detemine and report to Region III your criteria related to temperatures, pressures, pump starts, etc... which if exceeded will be used to establish unit shutdown requirements.

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. .. CONFIRMATORY ACTION LETTER Commonwealth Edison Company 2 JUL18 W CAL-RIII-88-107-A

6. Repair or replacement of valve 2FW0033 shall comence no later than July 15, 1988.

7. If Unit 2 should be shutdown for any reasons and repairs are not completed to valves 2FW0032, 2FWOO33, and 2FW0069 notify RIII prior to restart of the unit.

It is our understanding that you will provide a fonnal report of the overall results of your reviews, analysis and corrective action to the Office of Nuclear Reactor Regulation and Region III upon completion.

We further understand that a restartup of Unit 2, as it relates to item 7 above, will only occur with concurrence of the Regional Administrator or his designee. Issuance of this Confirmatory Action Letter does not preclude the issuance of an order requiring implementation of the above cocnitments.

None of the actions :;pecified herein should be construed to take precedence over actions which you feel necessary to ensure plant and personnel safety.

Please advise us immediately if your understanding differs from that set forth above.

Sincerely

, 6

• , A. Bert Day s Regional Administrator cc T. J. Maiman, Vice President, PWR Operations H. Bliss, Nuclear Licensino Manager G. J. Pliml, Station Manager Jan Norris, Project Manager, NRR DCD/DCB (RIDS)

Licensing Fee Management Branch Resident Inspector, RIII Richard Hubbard i l

J. W. McCaffrey, Chief, Public Jd l

Utilities Division s(p Mayor, City of Zion W fe v e

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