ML19210B633
| ML19210B633 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 02/22/1974 |
| From: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| To: | John Miller METROPOLITAN EDISON CO. |
| References | |
| NUDOCS 7911110107 | |
| Download: ML19210B633 (2) | |
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{k-j K IN O C P P T U C Li A. P EN t. L Y'.. A N I A ES February 22, 197 '.
Metropelitan Edison Conpany Docket Nos. 50-239 Attenticn:
Mr. J. G. Miller 50-320 Vice President P. O. Ecx 542 Reading, Pennsylvania 19603 Gentlemen:
The enclosed Directorate of Regulatory Operaticns' Information Request No. 74-2 is sent to you for response.
Please submit your repit within thirty (30) days of the date of this lettor to this office with a copy to the Assistant Director for Construction and Operatien, Directorate of Regulatory Operations, U. S. Atcaic Energy Commission,1.'ashington, D. C.
20545.
Very truly yours,
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gn'es P. O'Reilly Director
Enclosure:
RO Information Request No. 74-2 Mr. J. Herbein, Station Superintendent cc:
Mr. R. C. Arnold, Vice President Mr. R. W. Heward, Project Manager, GPUSC Mr. T. M. Crimmins, Jr., Safety and Licensing Manager, GPUSC bec:
RO, Files g Central Files PDR Local PDR NSIC DTII.
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E::CLOFir Directorate of Regulatory Operations Information Request ::o. 74-2 PC !!AI:: STEX! LI::E ISOLATIC:: VALVES In the past several months Regulatory Operations has receiv*ed notification of a number of abnormal occurrences involving main steam isolation valves at various PCR facilitics. Licensecs' investigations following preopera-tional tests and spurious valve closures have indicated that these valves, particularly those of the check-valve type, may be subject to generic failures.
To permit evaluation of the e:: tent of the probica, the suitability of specific valves for isolation purposes under postulated steam line rup-ture accident conditions, and the appropt:iateness of possible rcnedial measures, you are requested to provide the follouing specific information:
1.
Facility name and unit number.
2.
A line diagram or sketch, showing the locations of the isolation valve (s) with some identification of the type of each valve (check; globe, gate; etc.).
3.
Assembly or sectional drawings of each valve type with dimensions and identificatica of material.
4.
Name of the manufacturer of cach valve type.
5.
Steam line pressure at full pouer and at hot stand-by conditions, compared with valve design pressure.
6.
Functional design requirements contained in the original -design specifications for each valve.
7.
An assessment of the adequacy of each valve type to perform the isolation. function under postulated steam line rupture accident conditions.
8.
Discussion of any operational malfunctions of cach valve.
In your response to this request, please also include information relating to modifications or other methods of resolutien which are planned or which may have been made to valves of this type installed, or scheduled tc be inst:.11cd, in your facility (ics).
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