ML19341C066
| ML19341C066 | |
| Person / Time | |
|---|---|
| Site: | Hatch, Vogtle  |
| Issue date: | 01/16/1981 |
| From: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| To: | John Miller GEORGIA POWER CO. |
| References | |
| NUDOCS 8102280574 | |
| Download: ML19341C066 (1) | |
Text
-_
^
.f a ucg'o g
UNITED STATES
~'
["
REGION 11 NUCLEAR REGULATORY COMMISSION g
, : *c o
101 MARIETTA ST N.W., SUITE 3100
[
AT LANT A, G EORGI A 30303
,' A N 161981 In Reply Refer To:
RII:JPO 50-321m 50-366 hk4
<~.~50-424,50-425;gt.c 3g g
' /,
I Georgia Power Company Sj d4Ng gIOOlh (II ATTN:
J. H. Miller, Jr.
u.s, k,,prg Executive Vice President y
270 Peachtree Street p
Atlanta, GA 30303 W~fQ g s s Gentlemen:
This Information Notice is provided as an early notification of a possibly significant matter. It is expected that recipients will review the information for possible applicability to their facilities. No specific action or response is requested at this time.
If further NRC evaluations so indicate, an IE Circular or Bulletin will be issued to recommend or request specific licensee actions.
If you have questions regarding this matter, please contact the Director of the appropriate NRC Regional Office.
Sincerely, j=%
James P. O'Reilly Director
.' Enclosu res :
1.
IE Information Notice No. 81-01 2.
List.of Recently issued IE Information Notices cc w/ enc 1:
M. Manry, Plant Manager C. E..Belflower, Site QA Supervisor W. A. Widner, Vice President and General Manager-Nuclear Generation K. M. Gillespie, Construction Project Manager
.E. D. Groover, QA Sit'e Supervisor
.D. E. Dutton, Project General Manager
.p:
i
- susamsiC
e SSINS No.:
6835 Accession No.:
8011040254 UNITED STATES NUCLEAR REGULATORY COMMISSION
'p
(/
0FFICE OF INSPECTION AND ENFORCEMENT WASHINGTON, D. C.
20555 January 16, 1981 IE INFORMATION NOTICE NO. 81-01: POSSIBLE FAILURES OF GENERAL ELECTRIC TYPE HFA RELAYS j
l Purpose :
The intent of this Information Notice is to alert licensees and holders of construction permits of a potentially generic problem involving defective coil spools used in General Electric (GE) type RFA relays.
Such defective relays 1
were recently found at Turkey Point Unit 4 (Docket No. 50-250).
Description of Circumstances:
The defective coil spools are fabricated of either black or clear Lexan, a j
polycarbonate material that is susceptible to surface cracking when exposed to hydrocarbons. The concern here is that such surface cracks could ultimately deteriorate to such a degree that relay actuation would be blocked by the resultant debris,-thereby inhibiting a required safety function.
Indications of the above mentioned cracks were recently detected on the RFA relaysused to sequence the emergency loads on the diesel generators at Turkey Point Unit 4 upon a loss-of-coolant accident coincident with a loss of offsite
' power. After detecting the cracks, theispare coils in the storeroom were in-
-spected and,-although these coils are new units, one was found to be cracked.
The possible failures of GE type RFA relays highlights two salient points:
(1) HFA relays have had a long' history of failures (e.g., GE has issued several Service In'.ormation Letters.(SIL) addressing these relays, the oldest one of
-which dates back to 1973, and it is anticipated that GE will issue a new SIL L
in the near future addressing this new concern);-(2) the cracking phenomena seems to be similar to that experienced on the cam followers used on GE type SBM switches (e.g., these cam followers are fabricated of Lexan, and af ter their exposure-to hydrocarbons during fabrication or during maintenance severe
-cracking ~resulted..See IE Information Notice No. 80-13 for additional details.)
-The above.information identifies means whereby the integrity of a major safety-related' system can be jeopardized or compromised by the blocking of relay actuation. Accordingly, this Information Notice is provided as an early notification of a possibly-significant matter that.is still under review by the NRC staff.
Recipients should,' therefore, review the information for possible applicability to their facilities. Although no specific action or response is requested at this time, further-licensee. actions may be requested or, required ~pending the' outcome of.the NRC staff evaluation.
- If you'have any question regarding this matter, please contact the-director of the appropriate.NRC Regional--Office.
a 9.
t e'
IN 81-01 January 16, 1981 RECENTLY ISSUED i
IE INFORMATION NOTICES Information Date of l
Notice No.
Subject Issue Issued to 81-01 Possible Failures of General 01/16/81 All Power reactor Electric Type HFA Relays facilities with an OL or CP 80-45 Potential Failure of.
12/17/80 All BWR facilities BWR Backup Manual Scram with an OL or CP Capability l
80-44 Actuation of ECCS in the 12/16/80 All PWR facilities Recirculation Mode While with an OL or CP in Hot Shutdown 80-43 Failures of the Continuous 12/5/80 All power reactor Water Level Monitor for facilities with OL the Scram Discharge Volume or CP at Dresden Unit No. 2 80-42 Effect of Radiation on 11/24/80 All power reactor Hydraulic Snubber Fluid facilities with OL or CP 80-41 Failure of Swing Check 11/10/80 All power reactor Valve in the Decay Heat.
facilities with ar. OL Removal System at Davis-
. or CP Besse Unit No. 1 80. Excessive Nitrogen Supply 11/10/80 All power reactor Pressure Actuates Safety-
- facilities with Relief Valve Operation to OL or CP
- Cause Reactor Depressur-ization 4
80-39
. Malfunctions of Soleno.id 10/31/80 All light water teactor Valves Manufactured By facilities with Valcor Engineering Corporation OLs or cps 3
J 80-38 Cracking in' Charging. Pump-
.10/30/80 All PWR facilities
. Casing' Cladding with an OL or CP 80-37
. Containment Cccler Leaks 10/24/80 All power reactor and Reactor Cavity facilities with
- Flooding at Indian Point OLs or cps
- Unit 2 OL = Operating Licenses CP = Construction Permits
+
9 r-T-
, - W '
--5vvs e-y*g,*-
+
ve g
n e
-+3
--mr
-t-vt-e
+-y
+
www-e i-r e v