ML17285B453

Potential Significant Deficiency & Part 21 Rept Re Insufficient Actuator Force to Open Atmospheric Dump Valves. New Plug Assembly & New Piston Ring Assembly Should Be Installed.Nrc Also Informed of Problem

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

AC CE& RA,TED

---

0,.... ,.~,,

ACCESSION NBR 8907170058 DOC.DATE: 89/06/28 NOTARIZED: NO DOCKET FAGIL:50-400 Shearon Harris. Nuclear Power Plant, Unit 1, Carolina 05000400 AUTH. NAME AUTHOR AFFILIATION STERUD,C.G. Control Components, Inc.

RECIP.NAME . RECIPIENT AFFILIATION HINNUNT,S. Carolina Power 6 Light Co.

SUBJECT:

Discusses potential significant deficiency under 10CFR-21 re atmospheric dump valves.

DISTRIBUTION CODE: DF01D TITLE: Direct Flow COPIES RECEIVED:LTR /

Distribution: 50 Docket (PDR Avail)

ENCL + SIZE:

NOTES:Application for permit renewal filed. 05000400 RECIPIENT COPIES RECIPIENT COPIES.

ID CODE/NAME LTTR ENCL ID CODE/NAME LTTR ENCL INTERNAL: NUDOCS-ABSTRACT R FILE 01 EXTERNAL: LPDR NRC PDR NSIC R

I D

NOZE IO ALL 'KIDS" R1XXPIENTS:

S 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 NEED j TOTAL NUMBER OF COPIES REQUIRED: LTTR 5 ENCL

e Control Components inc.

An lMIvalve company Fl',qr, tw ~ ~~ ~ ~

June 28, 1989 JiJh 2 g ),"g

/

~/vl'p T, - p. yo 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 N. Carolina 27562

Subject:

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 NRC's ifinterest this is a significant deficiency. However, because of the 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.

cyp~8 p7170058 85000+00 fo PDR *gOCA 0 PN 8 pj's 22591 Avenida Ernpresa Q Rancho Santa Margarita, California 92688 Telephone: (714) 858-1877 C3 FAX: (714) 858-1878 Q Telex: 685500

P age 2

~ , ~Carolina 4

Power & Light 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 ix s adjustment of pressure switches inside the'e actuator and in-h'u'

. volves the actuator supplier to do a detailed review of thee ac tuator o

specifications.

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,