ML19344A729
| ML19344A729 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 07/24/1980 |
| From: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| To: | Arnold R METROPOLITAN EDISON CO. |
| References | |
| NUDOCS 8008220081 | |
| Download: ML19344A729 (1) | |
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/,prnogjo UNITED STATES g
NUCLEAR REGULATORY COMMISSION e
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j REGION I E31 PARK AVENUE Q4
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'iG-320 July 24,1980 Metropolitan Edison Company ATTN:
Mr. R. C. Arnold Senior Vice President 100 Interpace Parkway Parsippany, New Jersey 07054 Gentlemen:
The enclosed IE Bulletin No. 80-18, " Maintenance of Adequate Minimum Flow Thru Centrifugal Charging Pumps Following Secondary Side High Energy Line Rupture,"
is forwarded to you for action.
A written response is required.
In order to assist the NRC in evaluating the value/ impact of each Bulletin on licensees, it would be halpful if you would provide an estimate of the manpower expended in conduct of the review and preparation of the report (s) required by the Bulletin. Please estimate separately the manpower associated with corrective actions necessary following identification of problems through the Bulletin.
If you desire additional information regarding this matter, please contact this office.
Sincerely,
@ff
['(,O B ce H. Grier
- irector
Enclosures:
1.
IE Bulletin No. 80-18 and Enclosure with 2 Attachments 2.
List of Recently Issued IE Bulletins CONTACT:
E. G. Greenman (215-337-5267) cc w/encls:
J. G. Herbein, Vice President-Nuclear Operations E. G. Wallace, Licensing Manager R. J. Toole, Manager, Unit 1 W. E. Potts, Manager, Radiological Controls, Unit 1 J. W. Brasher, Manager, Radiological Controls, Unit 2 J. J. Colitz, Manager, Plant Engineering, Unit 1 J. J. Barton, Manager Site Operations, Unit 2
- 8. Elam, Manager, Pla.it' Engineering, Unit 2 R. F. Wilson, Director - Technical Functions L. W. Harding, Supervisor of Licensing G. K. Hovey, Director, Unit 2
- 1. R. Finfrock, Jr.
R. W. Conrad J. B. Lieberman, Esquire G. F. Trowbridge, Esquire Ms. Mary V. Southard, Chairperson, Citizens for a Safe Environment 8 0082 20 c t i
4 SSINS No.: 6820 Accession No.:
UNITED STATES 8005050062 NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT WASHINGTON, D.C. 20555 IE Bulletin No. 80-18 Date:
July 24, 1980 MAINTENANCE OF ADEQUATE MINIMUM FLOW THRU CENTRIFUGAL CHARGING PUMPS FOLLOWING SECONDARY SIDE HIGH ENERGY LINE RUPTURE Description of Circumstances:
Letters similar to the May 8, 1980 notification made pursuant to Title 10 CFR Part 21 (enclosure) were sent from Westinghouse to a number of operating plants and plants under construction (list, within enclosure) in early May, 1980.
~
The letters cr.d the enclosed "Part 21" letter contain a complete description of the potentiel problem summarized below. The letters indicated that under certain conditions tne centrifugal charging pumps (CCPs) could be damaged due to lack of minimum flow before presently applicable safety injection (SI) termination criteria are met. The particular circumstances that could result in damaga vary somewhat from plant to plant, but involve unavail-ability of the pressurizer power operated relief valves (PO.RVs), with operation of one.or more CCPs repressurizing the reactor during SI fellowing a secondary system *high energy line ~reak. Since the SI signal automatically isolates o
the CCP mini-flcs retura line, the flow through the CCPs is determined by the individual pump characteristic tead vs. flow curve, the pressurizer safety valve setpoint, and the flow resistances and pressure losses in the piping and in the reactor core. That minimum flow may not be adequate to insure pump cooling, and resulting pump damage could violate design criteria before current SI termination criteria are met.
Westinghouse recommends that plant specific calculations outlined in the letter (enclosure) be performed to determine if adequate minimum flow is assured u der all conditions. If adequate minimum flow is not assured, Westinghouse recommends specific equipment and procedure modifications which will result in adequate minimum flow. The recommended modifications assure availability of the necessary minimum flow by assuring that the mini-flow bypass line will be open when needed, but will be closeo at lower pressures when the extra flow resulting from bypass line closure might be necessary for core cooling.
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