ML20210B269

Informs That Rept on Relief Valve Blowdown Test Program Will Be Transmitted by 730514.Static & Dynamic Analysis Performed to Determine Behavior of Torus During Relief Valve Piping Clearing Transient & Conclusions Discussed

ML20210B269
Person / Time
Site:	Quad Cities, 05000000
Issue date:	04/30/1973
From:	Hinds J GENERAL ELECTRIC CO.
To:	Skovholt D US ATOMIC ENERGY COMMISSION (AEC)
Shared Package
ML20209J032	List: ML20209J028 ML20209J102 ML20209J362 ML20209J414 ML20209J428 ML20209J450 ML20209J504 ML20210A204 ML20210A316 ML20210A365 ML20210A410 ML20210A454 ML20210A522 ML20210A538 ML20210A585 ML20210A633 ML20210A720 ML20210B005 ML20210B037 ML20210B073 ML20210B140 ML20210B165 ML20210B193 ML20210B233 ML20210B262 ML20210B269 ML20210B312 ML20210B376 ML20210B424
References
FOIA-87-40 2976, NUDOCS 8705050276
Download: ML20210B269 (2)

Text

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fR NUCLEAR ENEROY GEMEll AL g ELECTRIC o m s ,0 N GENERAL ELECTRIC COMPANY,175 CuRTNER AVENUc. SAN JCSE, CALIFOANfA 9$114 ^ "

Phone (408) 207 30C0. TWX NO. 910 338 0116 DEPARTMENT 50-254 '~.

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s9,. . ,. 4 April 30,1973 dY c.M:,y;, ' I} k 5 .~

3, U.Q I,MY7 1973 ,.

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Mr. D. J. Skovholt . .' - d Assistant Director for ~ . : " a... -

Operating Reactors United States Atcmic Energy Commission Washington, D. C. 20545

SUBJECT:

QUAD CITIES RELIEF VALVE BLO'.lCC',A TEST pROGPRt Some time ago, General Electric had indicated to your Mr. John Riesland that a report documenting our analysis of the Quad Cities relief valve blowdown tests would be submitted to the AEC in mid April,1973.

This letter is intended to inform you of the current status of the subject report. At this time, all engineering analytical work has been completed, the report is in the publication cycle, and will be trans-mitted by May 14, 1973.

As was discussed with Mr. Riesland, both static and dynamic analysis have been perfomed to detemine the behavior of the torus during the relief valve piping clearing transient which results from the opening of a relief valve at reactor operating pressure. Our studies have concluded that the dynamic analysis is the proper mechanism for evalua-tion of the phenomena.

As a result of these evaluations, the following significant conclusions have been reached:

1. The analytical results support the conclusion that the allowable design parameters will not be exceeded in the torus or ECCS suction header due to forces resulting from the opening of relief valves in any torus / light bulb type containment with a design pressure of 56 psig or greater.

O 6 070420 THOMASU7-40 PDH nt SunE 70 INCLUCE MAIL CCCE ON R37UnN coutSPONCEN@@ " G ' 1 _____

GENER AL lj ELECTRIC Mr. D. J. Skovholt April 30, 1973

2. In answer to Mr. Riesland's recent question, based on this analysis, there is no concern about the fatigue life of the torus or ring header during the life of the plant. Considering the combination of cycles and stress levels involved during relief valve opening incidents, the usage factors are very low.

3. For containments with lesser design pressures, it is our judgment that the structure will be adequate to contain the expected forces involved during relief valve opening incidents and that, therefore, no significant safety problems exist. Further confinnation of their containment adequacy is available due to the fact that single and multiple relief valve openings have occurred at these plants with no noticeable adverse effects.

We trust that the foregoing information will be of help to you during the short interim period until final publication of the report.

Sincerely 7

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fohn A. Hinds, Manager

. Safety & Licensing smk l

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