ML20008F165
| ML20008F165 | |
| Person / Time | |
|---|---|
| Site: | Washington Public Power Supply System |
| Issue date: | 02/02/1981 |
| From: | Mazur D WASHINGTON PUBLIC POWER SUPPLY SYSTEM |
| To: | Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| References | |
| 10CFR-050.55E, 10CFR-50.55E, GO1-81-27, NUDOCS 8103120423 | |
| Download: ML20008F165 (2) | |
Text
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R p Washington Public Power Supply System A JOINT OPERATING AGENCY S
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P O 6.o n 9 4 8 3000G,0 W asapearcas War RecMLasso WasM %atoes 99 3 S 2 Pwows (SO9137S 8000 fit. clear Regulatory Comission February 2,1981 Region V G01-81-27 Suite 202, Walnut Creek Plaza 1990 fl. California Boulevard Walnut Creek, California 94596 y,
Attention: Mr. R. H. Engelken, Director g tr u Gentlemen: g3(,c.,f'ne[V4yA .7
Subject:
WPPSS fluclear Projects flos. 1 & 4 Docket tios. 50-460 and 50-513 1
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h ke4 A fg ?j/ gI b Reportable Deficiency 10CFR50.55(e)
SPEf4T FUEL CASK HAfiDLIfiG CRA!1E
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Reference:
- 1) Telecon TJ Houchins, WPPSS to DF Kirsch, Regt fiuclear Regulatory Commission dated January 7,1981 In reference 1) the Supply System informed your office of a reportable deficiency under 10CFR50.55(e).
Attachment A to the letter provides the WPPSS interim report on the subject condition. A final report will be submitted upon completion of this review.
If you have any questions or desire further infomation please advise.
Very truly yours,
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[ D. W. Mazur Program Director - WilP-1/4 pm Attachment cc: Jr Lewis - Bonneville Power Administration CR Bryant - Bonneville Power Administration V. Mani - United Engineers & Constructors, Inc.
V. Stello - Director of Inspection and Enforcement - flRC g ,
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- ATTACHMENT A WNP-1/4 DOCKET NOS. 50-460 AND 50-513 REPORTABLE CONDITION 10 CFR 50.55(e)
SPENT FUEL CASK HANDLING SYSTEM INTERIM REPORT BACKGROUND As described in the WNP-1/4 PSAR in 1973, the General Services Building (GSB) which houses the spent fuel storage pool and handling equipment was designed based on a 150 ton spent fuel cask dropping a maximum distance of 30 feet. At that time, the structural design was based on analysis of missile penetration into a rigid barrier. Based on this analysis, it was determined that the structure could withstand the drop of the fully loaded cask due either to a single failure or as a result of an SSE without affecting the ability to shutdown the plant and echieve a cold shut down.
DESCRIPTION OF DEFICIENCY It has been determined that the previous analyses is non-conservative.
By applying an energy balance approach, it has been determined that much nore restrictive load limits must be placed on the GSB structure.
Consequently, credit can not be taken for the GSB to withstand the drop of the design load through 30 feet without affecting critical plant equipment.
SAFETY IMPLICATIONS The effects of an unrestrained drop of a 150 ton cask could damage crit-ical plant equipment either through direct impact, through the spalling of concrete, or by affecting the building structure and subsequently the equipment itself. The systems which could be affected by the drop include the Containment Spray System, Decay Heat Removal System and
. Auxiliary Feedaater System.
REPORTABILITY Based on the evaluation of this condition, it is determined that the condition, if left oncorrected "could have affected adversely the safety of operators" of the plant upon failure of the spent fuel cask crane.
Therefore, the condition has been determined to be reportable.
CORRECTIVE ACTION TAKEN Two alternatives are being considered to resolve this issue. Modifica-tion of the existing spent fuel cask cranes (1 per plant) to be seis-mically qualified and reduadant would meet the requirements. The other alternative under consideration is to leave the crane as is and provide protection to the GSB through.the use of impact limiting crushable structures.
Once the decision is made on which alternative should be implemented, a final report will be prepared and submitted.