ML20055A345

Forwards Semimonthly Rept 17 for Diablo Canyon Nuclear Power Plant,Unit 1 Independent Seismic Reverification Program, 820622-820706

ML20055A345
Person / Time
Site:	Diablo Canyon
Issue date:	07/09/1982
From:	Denison E ROBERT L. CLOUD ASSOCIATES, INC.
To:	Harold Denton, Engelken R, Maneatis G NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V), Office of Nuclear Reactor Regulation, PACIFIC GAS & ELECTRIC CO.
References
P105-4, NUDOCS 8207160181
Download: ML20055A345 (4)

Text

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ROBERT L. CLOUD ASSOCIATES, INC.

128 UNIVERSITY AVENUE BERKELEY, CALIFORNIA 94710 84151 841 9296 P105-4 July 9, 1982 .

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Mr. G.A. Maneatis, Senior Vice President Facilities Development Pacific Gas and Electric Co.

77 Beale Street San Francisco, CA 94106 Mr. H.R. Denton, Director Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Washington, D.C. 20555 Mr. R.H. Engelken, Regional Administrator Region V U.S. Nuclear Regulatory Commission 1450 Maria Lane, Suite 210 Walnut Creek, CA 94956 Mr. W.E. Cooper Teledyne Engineering Services 130 Second Avenue Waltham, MA 02254 Docket No. 50-275 Diablo Canyon Unit 1 License No. DPR-76 jfggg(]f.

Gentlemen:

Enclosed please find Open Item Reports 1094, 1095 and 1096 j Revision 0 issued by Robert L. Cloud and Associates during i the prior reporting period.

j Yours truly, l

Edward Denison Project Manager, Diablo Canyon Nuclear Power Plant c.c: H. Schierling (2)V R. Fray ry

R. Reedy j)

F. Sestak H.H. Brown -

D.F. Fleischaker J. Reynolds B. Norton 8207160181 820709 A.C. Gehr gDRADOCK 050002g

, OPEtt ITEM REPORT File !!o. 1094 File Revision flo. 0

1. Date reported to PG&E and TES July 5,1982

2. Scheduled for RLCA (Originator) Semimonthly Report tio. July

3. Responsive to PG&E Technical Program: Task (if applicable)

4. Prepared as a result of:

a. O QA Audit and Review Report of

b. O Field Inspection Deficiency

c. O Independent Calculation Deficiency

d. O Seismic Input Deficiency .

c. O Design f4ethodology Deficiency

f. B Other Deficiency

5. Structure (s), system (s) or component (s) involved:

Intake Structure - Soils Review

6. Description of Concern:

The location of borings 2 and 3 as presented in "A Geophysical Investigation of Compacted Earth Fill at Diablo Canyon Nuclear Power Plant, March 8, 1978" is not consistent. Plate 1 shows boring 3 to be west of boring 2. Plate 6, which agrees with the field boring logs, shows boring 3 to be east of boring 2.

7. Significance of Concern:

RLCA to assess the significance of this item at the conclusion of the soils review.

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8. Recornnendation: ,

! . PG&E to clarify the location of borings 2 and 3.

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9. Signature: [Q((_7[6 p_L(Orig ina tor / Organ ization)

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_ .u a 4- A 44 4-,* ~a~ + . - *A- 4 - J* - -- - --- - A --.A4- - a -e- m a *.44*-  % ---4.ti*i 4=4 .s - -

OPEf! ITEi! REPORf f ile !!o. 1095

-i file Revision t!o. 0

'. 1. Date reported to PG&E and TES 7/9/82 4

2. Scheduled for RLCA (Origina tor) Semimonthly Report fio. _ Ju1Y

3. Responsive to PGLE fechnical Program: Task (if applicable)

4. Prepared as a result of:

d. O QA Audit and Review Report of

, b. O Field Inspection Deficiency

c. O Independent Calculation Deficiency

d. G Seismic Input Deficiency .

e. O Design Methodology Deficiency

f. O Other Deficiency l

S. Structure (s), system (s) or component (s) involved:-

8 Auxiliary Building -

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• 1 6. Description of Concern: -

i The input time history obtained from URS/Blume may not conservatively envelope the Hosgri design spectra at 4 certain frequenci'es.

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7. Significance of Concern: i This concern gives rise to the potential that the floor response spectra obtained from the input time history may not be conservative at all frequencies.

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8. Recornaendation: -

l RLCA to assess,the technical signifi.cance of this item.

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OPEll ITEi1 REPO.U File !!o. 1096 File Revision Plo. n

1. Date reported to PGLE and TES 7/9/82

2. Scheduled for RLCA (Originator) semimonthly Report fio. July

3. Responsive to PG&E lechnical Program: Task (if applicable)

4. Prepared as a result of:

a. O QA Audit and Review Report of

b. O Field Inspection Daficiency c . (J Independent Calculation Deficiency

d. O Seismic Input Deficiency '.

e. O Design liethodology Deficiency '

f. O Other Deficiency

5. Structure (s), system (s) or component (s) involved:

Supply Fan S-31

6. Description of Concern:

• The stress es for supply fan S-31 calculated in the verification analysis differ form the corresponding analysis by more than 15%.

7. Significance of Concern: ,

The verification analysis shows stress above the allowable value. .

8. Recornaendation: .

RLCA to complete a Potential Error Report.

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