ML19207B755
| ML19207B755 | |
| Person / Time | |
|---|---|
| Site: | Quad Cities  |
| Issue date: | 08/14/1979 |
| From: | Lainas G Office of Nuclear Reactor Regulation |
| To: | Schwencer A Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 7909050217 | |
| Download: ML19207B755 (3) | |
Text
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UNITED STATES y y e.( 3 i NUCLEAR REGULATORY COMMISSION p
WASHINGTCN, D. C. 20S55
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AUG 141979 MEMORANDUM FOR:
A. Schwencer, Chief, Operating Reactors Branch #1, DOR FROM:
G. Lainas, Chief, Plant Systems Branch, D0R
SUBJECT:
REQUEST FOR ADDITIONAL INFORMATION - CONTAINMENT PURGE SYSTEM - ZION STATION UNITS 1 AND 2 (TACS 10200 AND 10199)
REFERENCES:
1.
Letter from C. Reed to D. Ziemann, T. Ippolito and A. Schwencer, " Containment Purging During Normal Plant Operation," dated January 2,1979.
2.
Letter frem C. Reed to H. Denton, " Additional Response Concerning Containment Purging During Normal Plant Operation," dated July 2,1979.
3.
Letter from C. Reed to H. Denton, " Correction to Additional Response Concerning Containment Purging During Normal Plant Operation, " dated July 5,1979.
Plant Name:
Zion Station, Units 1 and 2 Docket Nos. : 50-254/265 Project Manager:
E. Reeves Review Status: Awaiting Information With regard to the z-tainment purge system and containment venting system at the Zion Station, Units 1 and 2, the licensee has attempted to justify unlimited purging. The Plant Systems Branch, after having reviewed the documents (Reference 1, 2 and 3) filed by the licensee, has identified several areas where additional information is necessary. Specifically, the following areas were identified as significant review areas:
1.
The licensee has not addressed debris which would prevent valve closure; testing availability of the valves; and allowable leak rates of the valves.
2.
The licensee has not provided the amount of containment atmosphere released througn the purge and vent isolation valves during the time required for them to close following a LOCA.
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AUG 141979 3.
The design of the override / bypass circuits for the purge isolation valves is deficient and modifications are necessary.
Therefore, we have prepared the anclosed request for additional information for transmittal to the licensee, d
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/ G. Lainas, Chief Plant Systems Branch Division of Operating Reactors
Contact:
D. Shum, X27110
Enclosure:
As stated cc w/ enclosure:
D. Eisenhut B. Grimes W. Gamill L. Nichols G. Lainas E. Adensam E. Reeves D. Tondi D. Shum J.T. Beard J. Kerrigan G. Knighton V. Noonan
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ENCLOSURE 1 REQUEST FOR ADDITIONAL INFORMATION FOR CONTAINMENT PURGE SYSTEM AND CONTAINMENT VENTING SYSTEM FOR ZION STATION UNITS 1 AND 2 DOCKET NOS. 50254/265 1.
With regard to the containment purge and venting system, provide tha following infornation:
a.
Discuss the provisions made to ensure that isolaticn valve closure will not be prevented by debris which could potentially become entrained in the escaping air and steam.
b.
Discuss the provisions made for testing the availability of the isolation function and the leakage rate of the isolation valves, individually, during reactor operation.
c.
Provide an analysis to demonstrate the acceptability of the provisiogs made to protect structures and safety-related equipment, e.g.,
j fans, filters and ductwork, located beyond the purge system isolation'.
valves against loss of function from the environment created by the i
escaping air and steam, i
d.
Specify the allcwable leak rates of the purge and vent isolation
.i valves for the spectrum of design basis pressures and ficws against which the valves mus: close.
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e.
Specify the amount of containment atmosphere released through the i
purge and vent isolation valves during the time required for them i
to close following a LOCA.
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2.
During our review of the electrical bypass / override features for the purge
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isolation valves, circuit design deficiencies have been identified (and made known to you).
Please describe (including appropriate electrical i
diagrams) the design changes you propose.
Discuss these changes with regard to the electrical-criteria stated in our November 28, 1978 letter.
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