ML20077C749
| ML20077C749 | |
| Person / Time | |
|---|---|
| Site: | Catawba  |
| Issue date: | 05/16/1991 |
| From: | Tucker H DUKE POWER CO. |
| To: | Martin R NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM), Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 9105230260 | |
| Download: ML20077C749 (2) | |
Text
Il 1
SAEG_AUS TORON e P.
Di sa a p HOM[THQph"u'r:
,; y 4 g
-=>
(f' ?
M DUKE POWER May 16, 1991 U.
5.
!!uclear Regulatory Commission ATTN: Document Control Desk Washington, D.
C.
20555 ATTil:
Mr.
R.
E.
Martin, ONRR OWFN, Mai1 Stop 91!3 Washington, D.
C.
Subject:
Catawba Nuclear Station, Units 1 and 2 Docket Nos. 50-413 and 50-414 Inte:?im Security Compensatory Measures for Main Feedwater (CF) System Valves and Piping
Dear Mr. Martin:
On April 16, 1991 at approximately 1452 hrs. with Unit 2 in Modo 1 of Power Operation, a 111 Ili Steam Generator (S/G) (P-14) signal was roccived which tripped the Main Turbine and the Train
'B' Main Feedwater (CF) pump resulting in an Auxiliary Feedwater (CA)
Autostart.
An investigation of the event revealed that the Main Feedwater By-pass Check Valves (2CF-166, 167, 168, 169) failed to seat properly. The failure of these valves required an evaluation of alternative physical protection options for plant equipment prior to returning the unit to operation. The Catawba Senior Resident Inspector and NRC Region II Safeguards Branch personnel have reviewed the event and the implemented interim security compensatory measures, however, since this is a vital area issue, Region II l
requested we provido details of the inplemented security l
compensatory measures for ONRR review and approval.
1 to this letter summarizes the event and the actions taken at Catawba to evaluate and implement interim security compensatory measures for portions of plant piping requiring physical protection until the faulty check valves can be replaced. Enclosure 2 through 6 contain system drawings marked to indicate piping flow paths and security patrol routes. As referenced in Enclosure 1, Licensee Event Report 50-414/91-006 dated May 16, 1991 provides additional technical details on the event.
kY.' &fforbN 1
msman msm
{DR ADOCN 0D000413 Il4M70 PDR y,;(ie Qgg g
U.
S. Nuclear Regulatory Commission May 16, 1991 Page 2 i request ONRR staff review of Enclosure 1 through 6 for a l dtermination of acceptability. Any questionD regarding the i
2nformation provided in this letter should be addressed to W.
R. Cross, Regulatory Compliance at (704) 373-8958.
Lt 6 %Lw Hal B. Tucker l# /I NO Enclosures ces w/ Enclosures Mr.
S. D.
Ebneter Regional Administrator, Region II U.
S. Nuclear Regulatory Commission P.
O.
Box 2257 Atlanta, Georgia 30301 Mr.
W. T. Orders Senior Resident Inspector Catawba Nuclear Station l
l
.. ~... _..
-...