ML17285B453
| ML17285B453 | |
| Person / Time | |
|---|---|
| Site: | Palo Verde, Harris, 05000000 |
| Issue date: | 06/28/1989 |
| From: | Sterud C CONTROL COMPONENTS, INC. |
| To: | Hinnant S CAROLINA POWER & LIGHT CO. |
| References | |
| REF-PT21-89 NUDOCS 8907170058 | |
| Download: ML17285B453 (3) | |
Text
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ACCESSION NBR 8907170058 DOC.DATE: 89/06/28 NOTARIZED: NO FAGIL:50-400 Shearon Harris. Nuclear Power Plant, Unit 1, Carolina AUTH.NAME AUTHOR AFFILIATION STERUD,C.G.
Control Components, Inc.
RECIP.NAME RECIPIENT AFFILIATION HINNUNT,S.
Carolina Power 6 Light Co.
DOCKET 05000400
SUBJECT:
Discusses potential significant deficiency under 10CFR-21 re atmospheric dump valves.
DISTRIBUTION CODE:
DF01D COPIES RECEIVED:LTR /
ENCL +
SIZE:
TITLE: Direct Flow Distribution:
50 Docket (PDR Avail)
NOTES:Application for permit renewal filed.
05000400 RECIPIENT ID CODE/NAME INTERNAL: NUDOCS-ABSTRACT EXTERNAL: LPDR NSIC COPIES LTTR ENCL RECIPIENT ID CODE/NAME R
FILE 01 NRC PDR COPIES.
LTTR ENCL R
I NOZE IO ALL 'KIDS" R1XXPIENTS:
PIZASE HELP US IO REDUCE HASTE CXWZACZ IHE DOCUMEPZ CONTROL DESKS ROCK Pl-37 (EXT. 20079)
%0 EIZM12Q5R KKR MME PRES DISTEGBVTIGN LISTS PCR DOCtlMENZS YOU DGHiT NEEDj D
S TOTAL NUMBER OF COPIES REQUIRED:
LTTR 5
ENCL
e Control Components inc.
AnlMIvalve company June 28, 1989 Fl',qr, tw
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Mr. Scot Hinnant Plant General Manager Carolina Power
& Light Shearon Harris Nuclear Plant HNP-OP5-RLC-BLDG P.O.
Box 165, SR-1134 New Hill
Subject:
N. Carolina 27562 Atmospheric Dump Valves CCI W 0 g 21739 1~2g3
& 4 Potential Significant Deficiency Under 10CFR-21
Reference:
APS Palo Verde Telecon 3/29/89
Dear Mr. Hinnant:
We are hereby notifying you of a potential significant deficiency that may be reportable u'nder the requirements of 10CFR-21.
We are not re-porting this directly to the Nuclear Regulatory Commission (NRC).
We at CCI do not have the systems expertise that would permit us to de-cide if this is a significant deficiency.
- However, because of the NRC's interest and their prior contact for information regarding plants with a similar design, we have sent a copy to Rich Lobel of the Events Assessments group in Washington D.C.
On March 29, 1989 we sent a letter to Mr. Bill Hindman at your plant stating that there was sufficient actuator force to overcome a poten-tial high load required to open the subject valve.
This was based on the assumption that the capability of the actuator was 20,000 lbs.
The 20,000 lbs is in error.
The maximum actuator load available is 9,000 lbs.
The actuator load required (worst case) is approximately 16,047 lbs.
It is necessary to modify the trim inside the valve to reduce the maximum potential load required to open.
We have a modi-fied trim design with which the maximum load required to open (worst case) would be approximately 5,346 lbs.
p7170058 85000+00 cyp~8 PDR
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22591 Avenida Ernpresa Q Rancho Santa Margarita, California 92688 Telephone: (714) 858-1877 C3 FAX: (714) 858-1878 Q Telex: 685500 fo pj's
Page 2
~, ~Carolina Power
& Light 4
The modification required consist of the following:
1)
New Plug Assembly This assembly includes a plug with a larger pilot capacity, a new stem and new stem retaining plate.
(The existing plug assembly cannot be modified to this new configuration.)
2)
New Piston Ring Assembly This new piston ring is an improved design for a much more con-sistent bleed control for valve function.
Also included with the piston ring is a new bushing guide.
These new parts fit into the existing valves without any field modifi-cation required to the valves.
Along with the trim modification the actuator load capability can be increased to provide added margin.
The actuator is capable of an output thrust of 12 000 lb h'u' adjustment of pressure switches inside the actuator and in-ix s
. volves the actuator supplier to do a detailed review of the t
specifications.
'e o
e ac uator Please contact myself, Ron Adams, Larry Stratton or Herbert Miller at CCI if you should have any questions or need additional information.
Sincerely, CONTROL COMPON TS INC Curtis G. Sterud Principal Engineer lif cc:
HLNiller LRStratton REAdams RTremblay.
~ SPerkj.nson JÃestmorland CONTROL COMPONENTS INC,