ML19208A950

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Submits Info Re Target Rock Safety Relief Valves,Per Bk Grimes 790716 Request
ML19208A950
Person / Time
Site: Brunswick  Duke Energy icon.png
Issue date: 09/14/1979
From: Utley E
CAROLINA POWER & LIGHT CO.
To: Ippolito T
Office of Nuclear Reactor Regulation
References
NUDOCS 7909180339
Download: ML19208A950 (2)


Text

A September 14, 1979 FILE: NG-3514(B) SERIAL: GD-79-2336 Office of Nuclear Reactor Regulation Attention: Mr. T. A. Iprolito, Chief Operating Reactors Branch No. 3 United States Nuclear Regulatory Commission Washington, D.C. 20555 BRUNSWICK STEAM ELECTRIC PLANT, UNIT NOS. 1 AND 2 LICENSE NOS. DPR-71 AND DPR-62 DOCKET NOS. 50-325 AND 50-324 INFORMATION ON TARGET ROCK SAFETY / RELIEF VALVES

Dear Mr. Ippolito:

In response to Mr. Brian Grimes' latter of July 16, 1979, requesting information on Target Rock safety / relief valves at 1.he Brunswick Steam Electric Plant Unit Nos. 1 and 2, Carolina Power & Light Company submits the following information:

1. What is the status of each of the Target Rock safety / relief valves at your plant (s)?
a. Are they in their original design configuration?

CP&L Response: Yea

b. What is the existing simmer margin?

CP&L Response: 100, 110, and 120 psig (setpoints at 1105, 1115 and 1125 psig; normal operating pressure is 1005 psig).

c. What modifications have you implemented to improve reliability?

CP&L Response: Increase setpoint (si=mer margin) by 25 psig.

J. On what date vera these scdifications made?

CP&L Response: Unit No. 2 - June 1978; Unit No. 1 - 360036 September 1978.

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O Mr. T. A. Ippolito 2. What main'cenance and testing do you routinely perform on these valves and how often is it performed?

CP&L Response: (1) PT 19.4 verifies setpoint, inspect and rebuild pilot assembly; 18 months.

(2) PT 11.1.2 verifies operability of ADS valves; 18 months.

3. What additional modifications and/or maintenance do you plan to implement in the future?

CP&L Response: None at present. We are observing and evaluating performance of the new two-stage topworks being tried at several other BWR's.

4. On what date will the modification (s) and/or maintenance in Item 3 be implemented?

CP&L Response: Not applicable.

We trust that this information .isfies the request for Target Rock safety / relief valve information.

Yours very truly, o' o /

E. E. Utley i Executive Vice President'.

Power Supply & Customer Services EEU/jcb I (5()(kbbh'