ML17139B846

Advises That AEOD Engineering Evaluation Rept Re Events Involving RHR Sys in Shutdown Cooling Mode Distributed to Appropriate NRR Branches & Project Manager

ML17139B846
Person / Time
Site:	Susquehanna
Issue date:	10/04/1983
From:	Harold Denton Office of Nuclear Reactor Regulation
To:	Heltemes C NRC OFFICE FOR ANALYSIS & EVALUATION OF OPERATIONAL DATA (AEOD)
Shared Package
ML17139B847	List: ML17139B846
References
NUDOCS 8310130189
Download: ML17139B846 (5)

Text

I awe OCT 0~ 1983 MEMORANDUM FOR:

C. J. Heltemes, Director Office for Analysis and Evaluation of Operational Data FROM:

SUBJECT:

H.

R. Denton, Director Office of Nuclear Reactor Regulation AEOD ENGINEERING EVALUATION REPORT ON EVENTS INVOLVING RESIDUAL HEAT REMOVAL SYSTEM AT SUSQUEHANNA UNIT 1

Reference:

Engineering Evaluation Report No. AEOD/E315 JULY 7, 1987 The subject report (reference

1) addresses two recent events involving operation of the residual heat removal system in the shutdown cooling mode at Susquehanna Unit l.

In accordance with our mutual understanding relative to the appropriate disposition of AEOD Engineering Evaluation Reports, we have distributed the subject reports to. the appropriate NRR branches and the Project Manager of the plant in question for their review.

They will review this information and make use of it in future evaluations and SRP revisions as appropriate.

cc:

K. Seyfrit A. Schwencer Original Signed hy g.R. Denton Harold R. Denton, Director Office of Nuclear Reactor Regulation h

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MEMORANDUM FOR:

FR SUBJEC C. J. Heltemes, Director Office for Analysis and Evaluation of Operational Data H.

R. Denton, Director Office of Nuclear Reactor Regulation AEOD ENGINEERING EVALUATION REPORT ON EVENTS INVOLVING RESIDUAL HEAT REMOVAL SYSTEM AT SUSQUEHANNA UNIT 1

Reference:

E ineering Evaluation Report No. AEOD/E315 JULY 7, 1987 The subject repor (reference

1) addresses two recent events involving operation of the re idual heat removal system in the shutdown cooling mode at Susquehanna Unit In accordance with our utual understanding relative to the appropriate disposition of AEOD Engi ering Evaluation Reports, we have distributed the subject reports to the app opriate NRR branches and the Project Manager of the plant in question fo their review.

They will review this information and make use of it in future valutions and SRP revisions as appropriate.

cc:

K. Seyfrit A. Schwencher Harold R. Denton, Director Office of Nuclear Reactor Regulation OR@6:~~ 0:DL

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UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D. C. 20555 JUL 8 1S83 MEMORANDUM FOR:

Harold R. Denton, Director v Office of Nuclear Reactor Regulation FROM:

SUBJECT:

C. J. Heltemes, Jr., Director, Off'ice for Analysis and Evaluation of Operational Data MISUSE OF VALVE RESULTING IN VIBRATION AND DAMAGE TO THE VALVE ASSEMBLY AND PIPE SUPPORTS A recently completed Engineering Evaluation. Report on the above subject is enclosed..Our evaluation concluded that severe damage to the,LPCI system injection valve was directly related to RHR system flow limitations that result from a combination of system design, configuration, flow control

system, and a low level of decay heat.

Further, current intermittent operation.of. the.RHR system, in the shutdown cooling. mode has the potential for cumulative damage and may be related to the valve operator motor burn-out that occurred in one of the events..

We believe it would be appropri ate to review RHR system operation. for compatibility with valve assembly design and qualification requirements.

By separate memorandum, we are. recommending that IE prepare an information notice to cover the extent of valve and pipe. support damage and the system conditions that led to the misuse of the valve.

cc:

R.

C. DeYoung, IE E. L. Jordan, IE T. E. Murley, Region I

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