ML20214T421

Requests Transfer of Lead Responsibility Re Licensee Failure to Seismically Mount high-range Noble Gas Effluent Monitor Noted During Insp on 840618-22

ML20214T421
Person / Time
Site:	Diablo Canyon
Issue date:	10/02/1984
From:	Bishop T NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
To:	Eisenhut D Office of Nuclear Reactor Regulation
Shared Package
ML20213E738	List: IR 05000275/1984007 ML20213E736 ML20213F014 ML20213F028 ML20213F157 ML20213F161 ML20213F166 ML20213F170 ML20213F182 ML20213F185 ML20214E696 ML20214T016 ML20214T080 ML20214T120 ML20214T141 ML20214T182 ML20214T191 ML20214T211 ML20214T271 ML20214T311 ML20214T334 ML20214T421 ML20214T453 ML20214T491 ML20214T582 ML20214T625 ML20214T670 ML20214T707 ML20214T725 ML20214T784 ML20214T834 ML20214T860 ML20214T871 ML20214T919 ML20214T946 ML20214T972 ML20214T976 ML20214T986 ML20214T994 ML20214U808 ML20214U872
References
FOIA-86-197, TASK-2.F.1, TASK-TM NUDOCS 8706100258
Download: ML20214T421 (3)

Text

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UNITED STATES NUCLEAR REGULATORY COMMISSION e

o e,E ftEGION V 0,

g 1450 MARIA LANE. SUITE 210 j

,d WALNUT CREE K, CALIFORNIA 94596 cci 2 8

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MEMORANDUM TO:

D. C. Eisenhut, Division of Licensing Office of Nuclear Reactor Regulation

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FROM:

T. W. Bishop, Director i

Division of Reactor Safety & Projects

SUBJECT:

DIABLO CANYON UNIT I HIGH-RANGE NOBLE GAS EFFLUENT MONITOR RE-29 (NUREG 0737, Item II.F.1, ATTACHMENT 1) SEISMIC DESIGN CRITERIA - REQUEST FOR TRANSFER OF LEAD RESPONSIBILITY -

j DOCKET No. 50-275

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1 During a Special Inspection of the PASS during the week of June 18-22, 1984, it was noted by the inspector that the High-Range Noble Gas Accident Monitor i

RE-29 did not appear to have been seismically mounted. The licensee performed a seismic analysis of this monitor as a result of the inspector's inquiry.

Region V received the enclosed PG&E IOM on October 1, 1984.

Based on discussions with the Radiation Protection Manager on October 1, 1984, Region V was informed that in view of the existing requirements they have no intention to implement the recommendations described in the enclosure.

i We consider implementation of the recommendation to be reasonable, prudent and j,

of trivial cost. However, we are sensitive to the back-fitting concern and request you review this matter and advise us as to whether or not the present seismic capabilities are acceptable.

Thank you for your consideration.

,[

?U 4 [ T. W. Bis op, Director Division of Reactor Safety & Projects

Enclosure:

Interoffice Memorandum Diablo Canyor Project

1. 058490 dtd 9/14/84 4

cc w/ encl:

G. Knighton, NRR l

H. Schierling, NRR R. Dodds, RV

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0706100250 870604 L

1 PDR FOIA HOLMES86-197 PDR

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INTEROFFICE MEMORANDUM q

Diablo CanyonProjectm -,.. n x

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. PACIFIC GAS AND ELECTRIC COMPANY

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"BECHTEL POWER CORPORATION 1

To R. C. Thornberry/ Attn: R. Patterson o.t.

Septamb r 14, 1984

3. B. Hoch/G. H. Peore Fa. No.

52.19 From j

m Management - DCP RE Seismic Evaluation sg i

DCPP 45/10/B29 B-0881

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CHEM & RAO P90T At I

,sva onc Ja< tv aE SEP. 2 41984. LW WAO SJFB as -

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REFERDJCE: 104 from J. C. Carroll to J. B. Hoch/ Attn G. Q Q re

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i dated August 20, 1984 Chren 4056610

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C & RP FILE RETURN TC

.l t'e n radiaticn nonitor RE-29 is ncn-class 1 equipment mounted on a steel a

platform at EL 140 within Area L.

The seismic design basis for this

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equi;z,ent -as in accordance with UBC Zcne 4 requirements (Horizontal l

acceleraticn - 0.2 g).

'Ihe seismic capability of the monitor's present anchorage is as follows:

(I) Horizontal & Vertical Seismic acceleraticn acting simultaneously (a) 0.6 g based cn AISC allcwable stress (b) 1.0 g based cn yield stres' i of'the materials.

7

'Ihe above capacities are based cn as is" configuratico in which it was noted that toth drill and tap screws are not effective in transferrirg the loads to the platform. 'Ibe seismic capacity of the anchorage would be enhanced if either of the follcwing (a-)-oc-(b) is taken:

(a) Replace toth drill ard tap screws with regular A325 tolts with nuts.

i (b) Provide 1/4" fillet weld (4 inches long) between 3/4" plate and W4X13 supporting mamb r of the same side as drill and tap screws.

'Ihe enhanced capacities will bes (II) Horizcntal & Vertical Seis=ic Acceleraticns acting sin:ultaneously (a) 1.7 g based cm AISC allowable stress (b) 3.4 g based cn yield stress of materials SEP 2 01984

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_ 3-R.C. 'Ihornberry/Attna R. Patterscm Septa ber 14, 1984 i

058490

~ If a dynamic analysis is performed, the seismic forcra inposed on the ntnitor during the three seismic events considered for class 1, structures will be Morizcntal Vertical Earthquake 1

acaleration acceleration Event

.a) 0.65 g 0.13 g DE f

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b) 1.30 g 0.27 g DDE c) 2.3 g 0.52 g HOSGRI

'1herefore if the monitor's anchorage is modified per above h.;endations, the enhanced capacity wx21d exceed the seismic denand inposed by DE, DDE l

and Hosgri earthquake events.

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'1his is a caplete response to the above referenced ICH.

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I J. B.

3 vitten sponse Required: No m/

c.c. J.C. Carroll 77/1435 W.H. White 45/26/A31 J.V. Boots DCPP N.O. Shah 45/26/C36 R.J. ftDevitt 77/1467 R.A. Bitting 45/9/D16 G.R. Kast 77/1435 l

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[023/05]

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