ML19249B908
| ML19249B908 | |
| Person / Time | |
|---|---|
| Site: | Fort Saint Vrain  |
| Issue date: | 08/15/1979 |
| From: | Seyfrit K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| To: | Millen C PUBLIC SERVICE CO. OF COLORADO |
| References | |
| NUDOCS 7909070068 | |
| Download: ML19249B908 (1) | |
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ARLINGTON, TEXAS 76012 9.....g August 15, 1979 Docket No. 50-267 Public Service Company of Colorado ATTN:
Mr. C. K. Millen Senior Vice President P. O. Box 840 Denver, Colorado 80201 Gentlemen:
The enclosed supplement to IE Bulletin 79-14 is forwarded to you to provide added guidance on the intent of the IE Bulletin.
If you desire additional information regarding this matter, please contact this office.
Sincerely,
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Karl V. Seyfrit /
Director
Enclosures:
1.
Supplement IE Bulletin No. 79-14 2.
List of IE Bulletins Issued in the Last Cix Months cc:
D. U. Waretbourg, Nuclear Production Manager Fort St. Vrain Nuclear Station P. O. Box 368 Platteville, Colorado 80651 L. Brey, Manager, Quality Assurance 323231 7 909 070068 ~
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UNITED STATES NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT WASHINGTON, D.C.
20555 Supplement IE Bulletin No. 79-14 Date: August 15, 1979 Page 1 of 2 SEISMIC ANALYSIS FOR AS-BUILT SAFETY-RELATED PIPING SYSTEMS Description of Circumstances:
IE Bulletin No. 79-14 was issued on July 2, 1979, and revised on July 18, 1979.
The Bulletin requested licensees to take certain actions to verify that seismic analyses are applicable to as-built plants.
This supplement to the Bulletin provides additional guidance and definition of Action Items 2, 3, and 4.
To comply with the requests in IE Bulletin 79-14, it will be necessary for licensees to do the following:
2.
Inspect Part of the Accessible Piping For each system selected by the licensee in accordance with Item 2 of the Bulletin, the licensee is expected to verify by physical inspection, to the extent practicable, that the inspection elements meet the acceptance criteria.
In perforning these inspections, the licensee is expected to use measuring techniques of sufficient accuracy to demonstrate that acceptance criteria are met.
Where inspection elements important to the seismic analysis cannot be viewed because of thermal insulation or location of the piping, the licensee is expected to remove thermal insulation or provide access.
Where physical inspection is not practicable, e.g., for valve weights and materials of construction, the license is expected to verify conformance by inspection of quality assurance records.
If a nonconformance is found, the licensee is expected in accordance with Item 4 of the Bulletin to perform an evaluation of the significance of the nonconformance as rapidly as possible to determine whether or not the operability of the system might be jeopardized during a safe shutdown earthquake as defined in the Regulations. This evaluation is expected to be done in two phases involving an initial engineering judgement (within 2 days), followed by an analytical engineering evaluation (within 30 days).
Where either phase of the evaluation shows that system operability is in jeopardy, the licensee is expected to meet the applicable technical specification action statement and complete the inspections required by Item 2 and 3 of the Bulleg"n.asJipop" L4ogible.
The licensee must report the results of these ins s.
ments for content and schedule as gi DUPLICATE DOCUMENT br.'*4'0r')s r
11 Fntire document previously entered into system under:
ANO N C $ O 9J O 3 f, C No. of pages:
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