ML19351E408
| ML19351E408 | |
| Person / Time | |
|---|---|
| Site: | Beaver Valley |
| Issue date: | 11/03/1980 |
| From: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| To: | Dunn C DUQUESNE LIGHT CO. |
| References | |
| IAL-80-43, IEB-79-14, TAC-42636, NUDOCS 8012100057 | |
| Download: ML19351E408 (3) | |
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Docket No. 50-334 N
E IAL No. 80-43 G
Duquesne Light Company ATTN: Mr. C. N. Dunn Vice President Operations Division 430 Sixth Avenue Pittsburgh, Pennsylvania 15219 Gentlemen:
Tais refers to your letters of August 14, September 11,~ and October 20, 1980 to this office regarding IE Bulletin 79-14 status and to the telephone conversation between you and Mr. Ebe McCabe of this office on October 28, 1980, regarding the same subject.
With regard to the matters discussed, we understand that you have undertaken or will undertake the following actions:
1.
Provide by November 30, 1980, to individual equipment vendors for confirmatory review, the calculations which support your evaluation that greater than six-inch diameter Code Class 1 nozzle loads are acceptable for design basis conditions.
2.
Provide confirmation that your evaluation of six-inch diameter and smaller nozzles listed in your letter of October 20, 1980 establishes that they meet the interim criterie of your letter of September 11, 1980 (loads less than allowable for design basis earthquake conditions plus dead load conditions).
3.
Issue-instructions necessary to ensure that the reactor will be shutdown for plant inspection in the event that a verified seismic acceleration of 0.01g or more is registered by the in-plant accelerometers and prior to your final evaluation that; a.
greater than six-inch diameter-Code Class 1 nozzle loads are acceptable incorporating inputs from individual equipm::nt vendors resulting from item 1 above, or b.
six-inch and smaller diameter nozzles loads are acceptable.
4.
Issue the instructions necessary to ensure that the reactor will be placed in a cold shutdown condition within seven days (or sooner if required by Technical Specifications) and that corrective actions will be completed prior to restart if:
a.
the seismic qualification of any safety system component is found to be improper, or if 8012100 097
Duquesne Light Company 2
b.
the calculated nozzle loads for any Seismic Class 1 equipment are found to be unacceptable for seismic design basis conditions based on your review incorporating inputs from individual equipment! vendors resulting from item 1 above, or if c.
any additional deficiencies requiring correction by modification are identified.
In no case will the interim criteria (DBEI + DL) of your September 11, 1980 and October 20, 1980 letters be applied to newly identified seismic qualification deficiencies without prior Commission approval.
5.
Review all modifications required to miscellaneous seismic Class 1 Systems.
a.
Identify those modifications which are required to prevent or mitigate design basis accidents and those which could impair the ability to place the plant in the cold shutdown condition, and complete those modifications prior to reactor startup.
b.
Each remaining modification is to be completed as soon as practicable, during power operation if possible, or during the first outage of sufficient planned duration.
The final IEB report will identify each incomplete modification, the time estimated to be necessary to accom-plish its installation, and your target date for each installation.
In any :ase, all such modifications will be completed prior to restart from the Cycle II-III refueling outage.
6.
Complete by November 30, 1980; a.
verification and evaluation of as-built data for insulated hangers and branch pipe lines, and b.
evaluation of baseplate and piping rack loadings.
7.
Complete by March 31, 1981; a.
review and evaluation of material substitutions, including final report submittal, and b.
review and evaluation of equipment nozzle loadings, including final repcrt submittal, and c.
re. view and detennination of the statt., of all incomplete IE Bulletin 79-14 items, including report submittal.
Y'
Duquesne Light Company 3
NOV 3 1980 If our understanding of your planned or completed actions described above is not
-in _accordance with your actual plans and actions being implemented, please contact this office by telephone and in writing within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.
Sincerely, 0
I //,
@gyb.l: Eke, Boyce H. Grier Director CC:
9 F.-Bissert, Techhical Assistant Nuclear R. Washabaugh, QA Manager J. Werling, Station Superintendent G. Moore, General Superintendent,-Power Stations Department J. 'J. Carey, Director of Nuclear Operations R. Martin, Nuclear Engineer J. Sieber, Superintendent of Licensing and Campliance, BVPS