ML18030A117

Final Rept for Limitorque Motor Operated Valve Stem Lock Nut Staking.All Suspect Valves Inspected & Staked.Ltrs Sent to All Suppliers Informing of Potential Problem

ML18030A117
Person / Time
Site:	Susquehanna
Issue date:	05/15/1980
From:	Burden H, Hollingshaus H, Poser E BECHTEL GROUP, INC.
To:
Shared Package
ML18030A116	List: ML18030A115 ML18030A117
References
MCAR-G-1, NUDOCS 8006200179
Download: ML18030A117 (5)

Text

MCAR G 1 IJKZOK(UE YOUR OPERATOR VALVE SZEM LCCX NUT STAKENG SUSQJEHANNA STEM EUZZCC STATION UNITS 1 5 2 Pz epared by: <4 if Checked b .

Approved by:

- Prospect Eng<~eet 2', 8 .

- Engineer ~ Y~et BECRIKL PCMER CORPORATION San R'ancisco, Califo~

Nay 15, 1980 P109/ll-1 80 D62QQ t +g

SCAR G-~ E~ Report Page 2 NLT2t 'Bo '9824 FOAL REPO& FOR LZKTORQUE YO33R OPs~i VALVE STOIC LOCK NUT STAIGM Ghe Q. A- FLyer 78-76 dated 7/6/78, outlined that a possible generic problan exits in regard to valve manufacturers fail~~ to stake the stem lock nuts when mxtallM~ r~torque motor operators Yodel Nos.

SMB & SK on their valves. Engineer~~ note: although the QA Flyer mentioned all ~torque operators StB & P!C hav~mg this problan, the sMcing is only ~ilved ~m ruing stan type valves. ~~ does not pertain to Che type of motor operators that are mounted on the valve shaft by neans of bore and keyway on a spl~med adapter. Also, at this time we have not ordered S!C i>odels nor do we have any at the Jobsite.

As a result of this, Eechtel SOHO notified Che Jobsite (IZ$ 095528, RIC3865, dated 11/8/78) of the potential problan and recamerded that all Limitorque operated valves be checked for properly staked lock nuts.

ZZSCRrPrrnr OF ~ m~ ~~. C During- the assanbly of'he valve/operator, the lock nut (which locks the stan nut in position) must be staked. D'his is not done, it is possible for Che lock nut to back out of the threaded hole and allow the stan nut to move up the stan arri render the valve operable.

ANALYSIS OF SAPK Y VPTZCA~EGNS At Bechtel ~0 request Che Jobsite inspected a sample of fM<teen (15) risi~

stem Limitorque motor operated valves and subnitted a list of the results.

A review of this list indicated that several of these valves were required for safe shut-down of Che plant. Therefore if sMdag is not done on these it is cossible valves, that are required for safe shutdown of the plant, that these valves could become inoperable. Eecause of this fact, we informed PP&L Chat CM~s was a reportable condition as described by 10CFR50.55(e) m~

our letter BLP-10630, dated Y~ch 20, 1979 (DC4 10150R).

1V. CORRECT'IE AC%ON T~

The cause of this problan is Chat the valve suppliers either improperly staked the stan lock nuts durir~ operator/valve assanbly or Chat stak.'Ln" was not performed. ~e following corrective action steps have been taken:

a. Eechtel SFEO I~ identified all suspect Limitorque motor operated ris~

stan valves usirg the Valve List Index Report for Susqueha~ Stan Wec-tric Station Units 1 and 2.

b. Eechtel ~O requested the Jobsite to inspect/stake these valves.

To date all Limitorque lfotor Operated valves, des~ated for ~~tallation or installed m~ Units 1 and 2 of SSE'S have bem inspected/staked (see Table 1), with the following exceptions:

~ P109/11-2

0 NCAR Kzal Page 3 Report 1- A total of 33 ."Q"= listed motor operated valves ranain to be inspected/

staked (See 'able Zi). 'IMs wade is documented in NCR 3424 ard will be ccmpleted prior to close-out af this NCR.

2. A total af 47 non-"Q" U.sted aator operated valves, designated for installation, ren"da to be inspected/staked. 'This work wiZJ. be accaa-plis?md by the use af Coniltion Report No. P-960.

c. In addition to the 80 valves tint have not bem inspected/staked to date,.

a total af 26 nor. "Q" nntor operated valves have been des'.wted as spare valves. 'Ihese valves will be added to the 47 non-"Q" motor operated valves specified in the CorrLLtion Report.

V. CGNCLUSICH 5N 26 80 3. ]. o 8 2 4 As stated in this report, all suspect Limitorque n;otor operated valves, designated for irstallation or as spares, have been identified ard measures have been taken to insp ct/stake these val.ves. In addition, letters have been sent to the fallowing valve suppliers inforning them af the potential problem: Anchor Darlirg, Nalworth, Henry Vogt, Yarway, N.V.D. and Pacific Valves. use letters were to assure that all Limitorque ris~~ sten motor operated valves at the suppliers were staked as well as all future orders.

Additionally, we reauested that the Eechtel PSQR's were aware of the stakLng requiranents arxi would ir~ct alI. risirg stem motor operted valves for proper stakLtg. Wherefore, we feel that we have adequately addressed generic problem which will be fina~ed with the clcsecut af NCR 3424 and the Condi-tion Report, P-960-

MCAR G-l Final Report Page 4 No. of Suspect No. of Valves No. of Valves Remarks Concerning Purchase Order M. 0. Valves Insa/Staked Not insaected Valves Not inscectec P-10A are tfQlt 73 ,70 3 3 P-11A 4 0 P-12A P-12B ill 8

101 7

10 1

1P are nQtf ffQlt P-14A 2 2 0 P-14B 2 2 0 P-15B 37 23 14 are ttQlt P-17A 16 14 ,2 2 are "Q"

'.F-21C 24 22 2 2 are non-"Q" P-22A 142 126 16 16 are non-"Q" P-22B 26 26 0 P-24A 55 38 17 17 are non-"Q"

<<Spares 26 0 26 "

Subtotal. 526 435 91 30 are ttQlt 35 are non-"Q" 26 are non-"Q" Spare Valves M-001 16 13. 3 are ItQtt M-002 34 22 12 are, non-"Q" 50 35 15 33 are tlQtt KlZAL 576 47P 106 47 are non-"Q" 26 are non-"Q" Spare Valves

<<NOZE: 'lee 26 Spare Valves are Non-"Q" and are not designated for installation in SOS.

P109/ll&

I 'Ib folio~ cable 1&ts the r~a:fnLng inspected/staked per the NCR 3424.

33 nQ" NCAR Q-.lrinal Repart Page 5

)g2S'80 listed valves to be

~a j OQ24

'ZABLE ZZ n0n M.O- VALVES NOT INSP~K0/STAKE P.O. VALVE ZDEÃZ~~CATZQN P-10A 2.04 14n-DBB-GO~10-2P006 252A P-10A 7.12 24n-DBB-GB-t~2P017B 249A" P-10A 17.02 4"-EBB-GT-i~1O-2P 012 252A P-12A 1.12 12n-GBB-GT-NO-2PO~~ 249E n 2. 02 24nABB-GT-YiO-2P004A 249A

2. 02 24n-HBB-GT-KQ-2P004B 249A 2 02 24n-HEI-GT-PO-2P004C 249A tt 2.12 16"-HBB-GT-i<O-2F04 2 252A 2.14 lpn-HBB-GT-WO-2P059 250B

2. 30 3n-HBB-GT-NO-2P0 7 5 252B 9 02 18n-GBB-GB-<410-2F024A 249A 9.12 24n-GBB-GBY-YiO-2P048A 249A P-12A 9.12. 24"-GBB-GBY-NO-2P048B 249A P-12B 1.28 6"-GBB-GT->iO-2P075B 216A P-15B 35. 21 2n-CBA-GT~MO-2P001B 283H n . n tt 35.22 2P001P 35-23 -2P 001K 35.24 tt -2P001P

-2. 002P lt 35.26

35. 27 ~002K tf tt 35.28 tl -2P002P tt

35. 41 tt ~03B tt 35-42 ~<003P tt -2FQQ3K

-2P003P tt 35.44 35-45 n -2F0006 35.46 n n ~pp7 P-15B 35.47 2n-CBA-GT~t10-2F009 283H'49G P-17A 1-02 24"-DCA~-NO-2P015A P-17A 3 02 6n-CCB-GB-YiO-2P023 24 N-001 3n-DB~~MO-25012 250B N-001 4n-CGA-GT-i<O-2P032A 264B N-001 4n~A-GT i'P032B 264B SUS Start-Up System N 0 ~ Notor Operated P109/11-5