ML20010B674
| ML20010B674 | |
| Person / Time | |
|---|---|
| Site: | Comanche Peak, Fort Calhoun  |
| Issue date: | 07/31/1981 |
| From: | Derienzo P GIBBS & HILL, INC. (SUBS. OF DRAVO CORP.) |
| To: | Seyfrit K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| References | |
| REF-PT21-81 10CFR-050.55E, 10CFR-50.55E, NUDOCS 8108170392 | |
| Download: ML20010B674 (5) | |
Text
DMB50 SS(')
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Gibbs B Hill. Inc.
E NGINE E RS DE SIGN E RS CONSTRUCTORS DIR E C T DIAL E XTE NSION (212) 760-July 31, 1981 Mr. Karl V.
Seyfrit M t f r ;A c
1 Director-Region IV Nuclear Regulatory Commission
(
/,/
v' 611 Ryan Plaza Dr.
9',/
- Ifl, ff Suite 1000 Ci 4
C2 4193 4,
"~
Arlington, Texas 76011
'83
Dear Mr. Seyfrit:
\\v Notification of a Potential De,fhct gNg '
- to the
Subject:
7 Rules of 10CFR21 Wl This will confirm my telephone call to your of fice with ~
Mr. Clif f Hale on Thursday, July 30, 1981 at approximately 4:15 p.m.,
in which I notified you of a potential defect relating to the rules of 10CFR21 with regard to the 'Ibrnado Venting System for Comanche Peak, Un its I;o. 1 and No. 2 as identified by one of our employees.
We have performed an initial review of the bases for the employee's concerns frem which we believe that these concerns will not compromise the plants ability to withstand the ef fects of a tornado.
Nevertheless, because available design documentation does not presently address all of the concerns that have been raised and because we have not been able to document the bases for our engineering judgement within the time constraints of the 10CFR21 regulations, we have notified you of this potential defect.
The description of the potential defect is presented in the attached documents.
We intend to complete our inhouse assessment by September 10, 1981 at which time we will notify you of the results and the bases for our judgement as to the safety impli-cations.
This matter arose out of our work on the Comanche Peak Project, and we have informed the appropriate official of the licensee.
8108170392 810733 I
(DRADOCK 05000285 de t PDR 393 SEVENTH AV E N U E NEW YORK. N Y.10 0 01 CABLE: GlB B S HILL, N EW YORK
Mr. Karl V.
Seyfrit July'.31, 1981' Page 2 As it also has possible-implications to the Ft. Calhoun Unit il that we designed, we have similarly advised that licensee of this notification.
Sincerely, GIB
& HILL, INC.
!)'
i t
,Ty
/ Paul P.
Rienzo Vice President Consulting Engineering PPD:paf and Quality Assurance.
cc: B. R. Clements (TUGCO)
R. Andrews (GPPD)
t -
OPD-1 Rev. 2 Pa ' 24 of 30 5
Date: 7/30/81 l
APPENDIX V REPORT OF A POTENTIAL DEFECT UNDER 10 CFR PART 21 Evaluation Number:
'81-01 Date:
7/30/81 To:
Director, NRC Region IV 611 Ryan Plaza Drive Suite 1000 Arlingte.a, Texas 76011 From:
Vice President, Consulting Engir.eering id QA Gibba & Hill, Inc.
Dravo Utility Constructors,'Inc.
393 7th Avenue New York, N.Y.
10001 Facility Name and Location:
1.
Comanche Peak SES Units 1&2 - Glen Rose, Texas 2.
Ft. Calhoun Unit No. 1 - Omaha, Nebraska Licensees 1.
Texas Utilities Generating Co. (TUGCO) 2.
Omaha Public Power District Co. (OPPD)
Docket Number: 1.
50-445 and 50-446 Date:
1.
7/20/73 2.
50-285 2.
4/18/67 License Type:
1.
Construction Permit Date:
1.
12/19/74 (CPPR126 & 127) 2.
Operation Permit 2.
5/23/73 (DPR 40)
Constructor:
(If Applicable)
Not Applicable Construction Subcontractor:
(If Applicable)
Not Applicable Component Vendor:
(If Applicable)
Not Applicable Component Subvendor:
(If Applicable)
Not Applicable G&H Design:
(If Applicable)
Tornado Venting System c
.a
.OPD-1 Rev.'2
- Page 25 of 30-
- Date: 7/30/81 Description of Potential Defect During a tornado event, the building housing safety related eculp-ment will be depressurized by 1.5 psi.for a few seconds and then repressurized back to normal ambient conditions.
There is some.
. concern that the cycle will cause damage to safety related equip--
ment and will prevent the -plant f rom.being shutdown. and maintained in a safe shutdown-condition.
Date information obtained:
July 28,'1981-14:45 p.m.
Description of Potential Safety Hazard In the event of a major tornedo, no. structure failure will occur; however,:there is concern that the'capabilityLto shut-the' plant down and maintain it in a' safe shutdown condition.might'be im-
~
paired.- The; impairment is assumed.to occur because of electronic equipment cabinet depressurization, internally-generated mis-siles, and from externally' generated missiles entering the control room.
' Defective Basic Component Safeguards, Auxiliary Buildings includ.
.ing control' room.
Number:
-In use:
At:
-Supplied for Use:
At:
-On Order:
For:
Other Facilities:
OPD-1 Rev. - 2 Page 26 of 30 Date : 7/30/81 Corrective Action By:
(See Note Below)
Organization - Gibbs'& Hill, -Inc.
Individual - Chief Mechanical Engineer Corrective Action Dates:
Final assessment of the potential defect will be made by 9/10/81.
Advice to Licensee:
B.
R.
Clements, TUGCO; Vice1 President-Operation and R. Andrews, OPPD; Section ' Manager-Operation were notified by phone at approximately 4:30 p.m. on 7/30/81.
4
/
7/Nf?j i
/G&H Vice Ptesident, Consulting #
Date Engineering and QA ( Designated Responsible Officer) i l
l No".e :
This report confirms the verbal notification made by L.
P.
P.
DeRienzo of G&H to Clif f Hale of NRC Region IV at 4:15 p.m. of 7/30/81.
l l
.