ML20099F242

Final Deficiency Rept DER 84-60 Re Unqualified Lubricant in Limitorque Operators.Initially Reported on 840827.All Valve Operators Flushed & Relubricated Prior to Fuel Load. Investigation Request IR-30 Initiated

ML20099F242
Person / Time
Site:	Palo Verde
Issue date:	11/12/1984
From:	Van Brunt E ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR
To:	Bishop T NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
References
ANPP-31096-TDS, DER-84-60, NUDOCS 8411260331
Download: ML20099F242 (6)

Text

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F.ECENED

- trac Arizona Public Service Company 3 I:0V 16 PM I: la November 12,19R'C'l'/ "

ANPP-31096-TDS/TRB U. S; Nuclear Regulatory Commission Region V 1450 Maria Lane - Suite 210 Walnut Creek; California 94596-5368

-Attention: Mr. - T. W. 31 shop, Director Division of Reactor Safety and Projects

Subject:

Final Report - DER 84-60 _

-A 50.55(e) Reportable Condition Relating To Unqualified Lubricant In Limitorque Operators.

File: 84-019-026; D.4.33.2

Reference:

A) Telephone Conversation between D. Hollenbach and T. Bradish on August 27, 1934 B) ANPP-30645, dated September 25, 1984 (Interim Report)

C) ANPP-30997, dated October 29, 1984 (Time Extension)

Dear Sir:

Attached is our final written report of the Reportable Deficiency under 10CFR50.55(e), referenced above.

Very truly yours, h %

(

E. E. Van Brunt, Jr.

APS Vice President Nuclear Production ANPP Project Director EEVB/'MB/nj Attachment ec: See Page Two 4

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. Mr. T. ;W.'T Bishop.

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-Office of Inspection and Enforcement U. S; Nuclear Regulatory Commission Washington; D..C.

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J. D. Houchen J. E. Kirby D. Canady 1-Records Center Institute of Nuclear Power Operations 1100 circle 75 Parkway, Suite 1500 Atlanta, CA 30339 i

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,. FINAL REPCRT ' DER 84-60 s

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DEFICIENCY EVALUATION 50.55(e).

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I escription'of' Deficiency D

_ w During the development-of the Limitorque type SMB operator preventive-

- maintenance program;.by APS' Maintenance, a review of the Limitorque instruction'and maintenance manual was conducted. This review S

revealed that for SMB/SB/SBD 000 and 00 models;. the. standard -

. lubricant; provided by Limitorque,.was Sun 0il Cc. 50-EP for serial-

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numbers below 295809. Exxon Nebula EP-1:is the only qualified y

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. lubricant approved for use.in nuclear containment' operators at the PVNGS. In additioni Sun 50-EP cannot be mixed' with Nebula EP-1.~

Since the PVNGS uses only Nebula EP-1-for lubrication.in all

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Limitiorque Valve operators; the possibility existed that the s

g flubricants may have inadvertently.been mixed.

A computer search was performed by.- APS Maintenance which identified a

-total of 50 type SMB 000 and 00 Limitorque operators at PVNGS Unit 1 as having serial numbers below 295809. : Ten of. the oprators

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identified are located in the containment, with the remaining 40

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located outside containment. NCR'SM-4645 was initiated by-APS L Maintenance to identify these' operators, stating that':: - (1) the 10 operators located in the containment have. unqualified lubricant; and

- (2) all'50 operators have mixed Nebula EP-1 and Sun 50-EP lubricmits.

The-first condition stated in NCR SM-4645; concerning unqualified lubricant in the containment, was based upon the assumption that Limitorque used their standard lubricant.(Sun 50-EP) in nuclear containment operators instead of a containment qualified lubricant

.(Exxon Nebula EP-0 or EP-1).

Limitorque has confirmed, however, that Nebula EP-1 vas supplied in nuclear containment units regardless of serial number (Reference 2).

Sun 50-EP was supplied.in outside containment and commercial SMB-000 and SMB-00 units up to serial number 295809. Limitorque further states (Reference 3) that " nuclear 3

containment units" refers only to those actuators that are required F

to' meet Limitorque's qualification requirements for the containment and not to " commercial" units, even though commercial units may be l.

locatedLin the containment. Based on the following, no unqualified h['

lubricant deficiency exists.

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Nuclear containment units were shipped with qualified Nebula EP-1.

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Sun 50-EP is an acceptable lubricant for ccmmercial i,

non-safety-related operators, containment or otherwise, T

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There.has been no evidence of qualified containment operators gWW containing Sun 50-EP lubricant.

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Final Report.

DER 84-60..

.Page'Two;

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[ Addressing the second condition,in NCR SM-4645, it:should be noted-5 again that Exxon Nebula'EP-1 is the only lubricant used at PVNGS for.

..-Limitorque operators. - lIn addition;. Nebula EP-0 and EP-1 are nearly

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identical and' interchangeable (i;e. Nobula EP-1 likewise connot be.

mixed with Sun 50-EP lubricant) ~.The second~ condition;-therefore; is

' assumed to exist in the non-nuclear containnent operators because'

. thesc' operators have had lubrication tags attached. The presence of

, a. lubrication tag does not necess'arily mean an operator was '

lubricated;-however; it.does indicate that the operator was inspected and; if required wasflubricated. '(It is assumed here that. operators

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with lubrication tags. attached were; in fact, lubricated). Since

- these operators were initia11y' lubricated with Sun 50-EP, a; mixture of lubricants would have resulted'in the non-nuclear containment operators with serial numbers below 295809.

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' The operator serial numbers identified in NCR SM-4645 are lister!

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below:

261461 269224 284387-287063 288893 292726 261975 269225~

284496 287351 288894 292943 261976 269232 285055 287352 289831-292944 262005 269239 285056 287502 291113 292945 262008 269240 286976 288134 291119 294946 263394 273406-286977 288136 291131 294947 263395 283104

- 287007 288137 291132

.295461 267729 283105 287062 288892 291763

'295462 295463 295465 Evaluation Limitorque's experience with mirJ% 1 wricants of-different soap

bases, i.e., Sun 50-EP (lith 1 i E.

se) and Nebula EP-0. or. EP-1 hardening and. caking which (calcium complex base), is,a rc.- y t.'

,/co. effects on'the operability diminishes the lubricating abbilty.

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of the actuators utider these conditions is indeterminate (Reference 4),

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Final' Report 1

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-DER,84-60=

( Page Three s

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.The root cause' of this' deficiency'(mixture of lubricants) may be i

'. partially attributed to the Limitorque instruction manual and

_ partially. to oversight'; All!of Lthe maintenance manuals lfor the

valves 1that use the-identified Limitorque operators contain'an.old

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revision' of :the Limit'orque ' instruction manual (SMBI-170). This

. manual contains.no.information as'to which lubricant was originally.

used nor does it contain a warning' about mixing Nebula EP-0 and Sun;50-EP.,iLimitorque had;provided: the PVNGS with the updated manual (SMBI-82),i however, *and 'it was used' by ~Startup as ithe source document.

for:the reconumended -lubricant;: As--indicated in INPO Significant Event Report.7-84~(Reference5)P usert.lwho received the updated.'

manual may=not.have~ noticed the.infornation on grease mixtures because' it.wasinot' highlighted andait was not emphasized :that~ the mixing of the two types of grease could degrade the lubricating qualities of the greases..

J-The : resolution to this: problem is to change the ' lubricant in all

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SMB' 000 and 00 Limitorque operators with serial numbers up to. 295809,.

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including nuclear containment units. This will ensure.that all of:

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the Sim 50-EP lubricant will be removed and thus eliminate the 1-possibility of greases being mixed-in any limitorque operator at PVNGS.

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II.

Analysis of-Safety Implications-The majority of the operators listed in Condition Description are Class l1E and are required to operate under accident conditions.

Should a mixture of greases exist in any of these operators and-not Y

be changed, the long term effects of thir deficiency-on the' ability of the' operators to perform their required function is uncertain.

1 Based on the above, this condition is evaluated as reportable..under the requirements of 10CFR50.55(e), since if this condition were to ~

remain uncorrected it could represent a'significant safety condition.

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This project evaluates this condition as not reportable under the y

requirements of 10CFR21. Although the operators are basic,

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rafety-related components,ithey were not defective at the time of delivery or installation.

In addition, the Institute of Nuclear Power Operctions~(INPO) has already published Significant Event Report 7-84 (Reference 5) identifying the problem of mixing lubricants in Limitorque operators.

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)TII. ". Corrective Action A. 'All; safety-related Limitorque SMB 000' and 00 valve. operators in-m-

Unit 1 with serial numbers below 295809 will'be flushed and relubricated' prior.to fuel. load..

.:B.

To preclude recurrence;~ Investigation Request IR-30 nas been initiated to inspec';-Unit 1 for any additional operators no.t u '

s identified by NCR SM-4645 and.to-investigate Units 2 and 3 for' the' subject operators All-identified operators will have their.

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. lubricants changed to Nebula EP-1 astrequiredi-

. C.

DuringtheoperationalphaseofUnits1;2,fand3,lubricationof[

valve operators are' to be-performed in accordance with the.

preventive maintenance program developed per PVNGS' Station Manual.

Procedure 30PR-92Z01; - For each Limitorque! valve operator;7 the-preventive maintenance task for inspection and lubrication

- specifically requires Exxou Nebula EP-0.or EP.1 to be the lubricant used.

D. ~ Limitorque's standard lubricant is currently, Exxon Nebula:

EP-0/EP-1;- The lubricant.in Limitorque. operators delivered in the future will thuis be consistent with the lubricant supp!r naintained at PVNGS.

IV.

References 4

1) Limitorque Bulletin SMBI-82 "Limitorque Type SMB Instruction and Maintenance Manual"

2) Telex, Limitorque to Bechtel, August 21, 1984

3) Telephone Notes, TN-E-3881, October 2, 1984 I

4) Letter, Limitorque to Bechtel, September 21, 1984~

5) INPO Significant Event Report 7/84

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