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 valves, that are required for safe shutdown of the plant, it is cossible 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 Report Page 3 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.CGNCLU SICH 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 Purchase Order M.0.Valves Insa/Staked Not insaected Remarks Concerning Valves Not inscectec P-10A P-11A P-12A P-12B P-14A P-14B P-15B P-17A'.F-21C P-22A P-22B P-24A<<Spares Subtotal.M-001 M-002 KlZAL 73 ill 8 2 2 37 16 24 142 26 55 26 526 16 34 50 576 ,70 4 101 7 2 2 23 14 22 126 26 38 0 435 13.22 35 47P 3 0 10 1 0 0 14 ,2 2 16 0 17 26 91 15 106 3 are tf Qlt 1P are nQtf ffQlt are ttQlt 2 are"Q" 2 are non-"Q" 16 are non-"Q" 17 are non-"Q"" 30 are ttQlt 35 are non-"Q" 26 are non-"Q" Spare Valves 3 are ItQtt 12 are, non-"Q" 33 are tlQtt 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 NCAR Q-.lrinal Repart Page 5)g2S'80~a j OQ24'Ib folio~cable 1&ts the r~a:fnLng 33 nQ" listed valves to be inspected/staked per the NCR 3424.'ZABLE ZZ n0n M.O-VALVES NOT INSP~K0/STAKE P.O.P-10A P-10A P-10A P-12A n tt P-12A P-12B P-15B tt P-15B P-17A P-17A 2.04 7.12 17.02 1.12 2.02 2.02 2 02 2.12 2.14 2.30 9 02 9.12 9.12.1.28 35.21 35.22 35-23 35.24 35.26 35.27 35.28 35.41 35-42 35.44 35-45 35.46 35.47 1-02 3 02 VALVE ZDEÃZ~~CATZQN 14n-DBB-GO~10-2P006 24n-DBB-GB-t~2P017B 4"-EBB-GT-i~1O-2P 012 12n-GBB-GT-NO-2PO~~

24nABB-GT-YiO-2P004A 24n-HBB-GT-KQ-2P004B 24n-HEI-GT-PO-2P004C 16"-HBB-GT-i<O-2F04 2 lpn-HBB-GT-WO-2P059 3n-HBB-GT-NO-2P0 7 5 18n-GBB-GB-<410-2F024A 24n-GBB-GBY-YiO-2P048A 24"-GBB-GBY-NO-2P048B 6"-GBB-GT->iO-2P075B 2n-CBA-GT~MO-2P001B n.n 2P001P-2P 001K tt-2P001P-2.002P~002K tl-2P002P tt~03B~<003P tt-2FQQ3K-2P003P n-2F0006 n n~pp7 2n-CBA-GT~t10-2F009 24"-DCA~-NO-2P015A 6n-CCB-GB-YiO-2P023 252A 249A" 252A 249E 249A 249A 249A 252A 250B 252B 249A 249A 249A 216A 283H tt lt tf tt tt tt 283H'49G 24 N-001 N-001 N-001 3n-DB~~MO-25012 4n-CGA-GT-i<O-2P032A 4n~A-GT i'P032B 250B 264B 264B SUS Start-Up System N 0~Notor Operated P109/11-5