ML19290E122

Discusses Seismic Separation Gaps at Facility.Evaluation of Deficiency Concludes That Design Requirement to Provide Adequate Rattlespace Has Been Met.Forwards Final Deficiency Rept & Supporting Data

ML19290E122
Person / Time
Site:	Limerick
Issue date:	02/07/1980
From:	Reinmuth G NRC OFFICE OF INSPECTION & ENFORCEMENT (IE)
To:	Baer R Office of Nuclear Reactor Regulation
References
NUDOCS 8003040304
Download: ML19290E122 (2)

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R!GUJtTORY 00CK!T Fl.! COPY FEB 7 E0 Docket No. 50-352/353 MEMORANDUM FOR: Robert L. Baer, Chief, LWR Branch #2, Division of Project Management, NRR FROM:

G. W. Reinmuth, Assistant Director, Division of Reactor Construction Inspection, IE

SUBJECT:

SEISMIC SEPARATION GAPS AT LIMERICK, UNITS 1 AND 2 (AITS F121ESHl)

This item was one subject addressed in the 10 CFR 2.206 request from Mr. Frank Romano, for which NRR issued a Director's Decision on October 9,1979. Additional information was issued on November 9, 1979 which corrected and clarified the -

original decision.

The subject of the seismic separation gaps and the final resolution of a 50.55(e) report was sent to IE Headquarters by memo dated September 14, 1978 from Region I.

The final reviewwas deferred due to other priority items. We have now reviewed this matter and are providing the following information.

It appears from the information presented by the licensee in the final report on the 50.55(e) item, that after recalculation all but two small areas meet the criteria that the provided gaps are at least two times the computed combined maximum deflections. We are unaware of any specific NRC requirement on what margin is required on calculated seismic deflections. The two areas where the ratios were less than 2.0 resulted in values of 1.7 and 1.8.

The structural elements resulting in. those values were wall joints. The area of the involved joints represented less than 17. of the total area that would be possible for movement during a seismic event.

In total our review of the over 400 measurements taken at wall and slab joint interfaces with the containment the general design values of 1", lh" and 2" and the maximum departure from these being -1/16" and more nearly -1/8" leads us to the conclusion that the design requirement to provide adequate rattlespace has been met.

It is our opinion that this matter has been adequately resolved.

CONTACT:

R. E. Shewmaker, IE 49-27551 8 0 03 0 4 g ]c(L,

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l R. L. Baer FEB 7 i320 By copy of this memorandum to the Structural Engineering Branch we are informing them of our evaluation. We wish to be informed whether NRR intends to pursue this matter or whether NRR agrees with our evaluation and acceptance of the resolution of the 10 CFR 50.55(e) item. We are enclosing a copy of the final l

50.55(e) report and other supporting data for your information.

If you have any questions, please contact us.

j i

G. W. Reinmuth Assistant Director j

Division of Reactor i

Construction Inspection Office of Inspection and Enforcement i

Enclosure:

Final 50.55(e)

Report and Supporting NCR cc/w enclosure:

F. P. Schauer, NRR l

0. L. Tibbitts, NRR i

i cc w/o enclosure:

H. D. Thornburg, IE R. T. Carlson, RI i

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Subject:

F"-=' Significant Deficiency Repcrt yh

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erick Generating S a-icn Units 1 & 2

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Sepa atic: Gaps between Cen""- +, and Reacter

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220 Ccns -" -"-- ta -"t Nos. 106 and 107

References:

(a) Telecen Report of Deficiency frc= H. R. 'Jalters

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PICO to 1. Oc t US EC I Regien I dated

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January 17, 1978

[ib (b) Interim Report for ' d-erick Genera ~,.ing Station f-Separatic: Gaps between Cen* * -ant and

[5 Reac ar Enclosure dated Feb nar/ 16, 1978 F

Fi e:

0.012., 2-10-2 (SIR #4)

Dear.Ah.

"-ier:

In c---M=-ae with 1CCIR Pa-t 50 55(e), we are hereby suWitting te attached f'- =' reper; en te subject separaden gap deficiency. The Philace_p: a - aa--"c Cc pany discussed tis ite= by telephone (Reference a) wi t t e 05'20 Regien I Office of Inspection and F forcement en January 17, 1978, 6 af ter it wa.s de,e.--"-ad ta: -lis =27 be a repc-table deficiency as defined L) by 10CFR ?a - 50 55(e). An n eri= repcrt (Reference b) en the subject

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was filed en Febr.:s.ry 16, 1978.

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If -le e are any questions en this =atter, we wculd be pleased to discuss de= with you.

t Sincerely, C

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Copy to: D. F.n st Volgenau, USIEC

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CN TEE ADEQUACY OF S E SEPARATION GA?S ED'IET TEE C0h".'A.2E:T JJ:D F2 ACTOR ECOSU?I Am

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June 1978

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