ML20207H270

Discusses Encl Test Results Re Disassembly & Insp of Sor,Inc Differential Pressure Switches Found Unacceptable for Use at Plant,Per Commitments Made in .Test Indicated Zero Leakage

ML20207H270
Person / Time
Site:	LaSalle
Issue date:	12/18/1986
From:	Allen C COMMONWEALTH EDISON CO.
To:	Harold Denton Office of Nuclear Reactor Regulation
References
2534K, NUDOCS 8701070493
Download: ML20207H270 (6)

Text

_ _ _ _ _ _ _ _ - _ _ _ _ _ _ - _ _ _ _ _ _ _ - .

[ \ Commonwealth Edison k '_'. d One / Address First Nabonal Reply Plaza, to: Post Office Chicago, Illinois Box 767

'v/ Chicago, Illinois 60690 0767 December 18, 1986 Mr. Harold R. Denton, Director Office of Nuclear Reactor Regulttion U.S. Nuclear Regulatory Commission Washington, DC 20555

Subject:

LaSalle County Station Units 1 and 2 SOR Differential Pressure Switches NRC Docket Nos. 50-373 and 50-374 Reference (a): September 12, 1986 letter from C. M. Allen to H. R. Denton

Dear Mr. Denton:

The letter fulfills commitments made in Reference (a). These commitments relate to the disassembly and inspection of SOR differential pressure switches found unacceptable for use at LaSalle County Station (LSCS).

On November 24, 1986, switch 2B21 NO38A (ADS Permissive-Level 3) was found with the setpoint beyond the Reject Limit. The switch was replaced and sent to SOR Inc. for disassembly and inspection, the results of which are attached. The switches were pressure tested, leak tested, disassembled and all components inspected and measured. In addition, to alleviate concerns that coolant might be leaking along the shaft past the "O" ring, an extremely sensitive test was performed using a halogen detector. This test indicated zero leakage.

Test conclusions are as follows: 1) there is no leakage along the shaft bypassing the "O" ring; (2) inspection of the wetted internals found "like new" conditions; (3) the setpoint drift could not be replicated during a 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> test at the factory.

A large burr was found on the setpoint adjusting screw which could account for the difficulty in attaining a stable setpoint during calibration.

This instability could not be duplicated at the factory.

If you or your staff have any additional questions regarding this issue, please address them to this office.

Very truly yours, 10 3h 3 __-

O C. M. Allen Nuclear Licensing Administrator im 90l fad. Is Ltc 2s3a

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pf December 11,'1986 Mr. Everett Spitzner Maintenance Staff Assistant COMMONWEALTH EDISON COMPANY PO Box 767, Room 1230 Edison Chicago, Illinois 60690

SUBJECT:

SOR 103 DELTA-P SWITCH Model 103AS-B212-NX-JJTTX6 Serial No. 85-1-2395 Switch I.D. NO 38A

Dear Mr. Spitzner:

This report is to summarize the results of the factory disassembly and inspection of the above listed Delta-P Switch.

Our incom!ng inspee finn indicated the switch was a " good performer" (test data is attached).

The switch was dis-assembled (per CECO /LaSalle procedure) and nothing was found to explain why the set point drifted out of tolerance. However, a large burr on the set point adjusting screw could account for the difficulty in attaining a stable set point during calibration. (We could not duplicate th!s instability at the SOR factory.)

The cross shaft o-rings were tested at 1000 psi with a halogen leak detector calibrated to indicate a leak of 0.1 oz/ year. The leak detector indicated zero leakage.

l The internal wetted parts of the switch were inspected for foreign substances l and found to be in "like-new" condition.

e

(

l As notedj 'previously, the adjusting screw has been added to the 100%

inspection:Het to eliminate the burr problem.

if you require additional data, please call.

Regards, O

l Vayn Priest, Chief Engineer Nes roduct Design WP:es/121186-07 9 0. OCX 591.11705 BLACKBOB ACAD. OLATHE. KANSAS 66C61. 913 764-2630. THE GAEATEA KANSAS CITY AAEA CABLE. SOA INC TELE a 42-6130 SOA. INC. Stacc o" Reg CONTAOL OEVICES INTE ANATIONAL TELEX NUMBEA 4994783 SOA UI

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Oifferential Pressure Switch Test Data Sheet 7301-105

_______________________________________________________a

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Graduations o. / " Graduations /d O M /

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Differential Pressure Switch Test 0sta Sheet 7301-10s

PO. BOX 591 11705 BLACxDO6 ROAD OLNHE. KANSAS 66064 K

g .O /ControlDesiCOS

<  ; i w pg DATA SHEET FOR 8601-027 16 Z

Reference:

?

5 Switch Serial No.

l$

3 Adjustable Range K -/- 239f 7-foo Ye_

Model No. fo345.E2sz- Ax- 11rTx/m Pressure Gauge: M fg . 3D Model No. 2S'<4 V-33135'l ~~ 3KD D Serial No. 6589 40 3 A) g y

Differential Pressure Indicator: Mfg . Roserwue/r -

N Model No. llsspp 4 s, L @

Serial No. yg2 *FB 2. [

Required Set Point /,3 f"a c Inc. / Dec.

Normal Static (Operating) Pressure /CSd p.5/ &

Data:  %==

Static Pressure less than 25 PSIG (Step 4 or 23) O PSI N

A) ' Set Point' '1,2,t/*plc ' ' , . .

.-~

"(Step 5 or 24) ' ~ ~ ~

B) Reset Point 57,0"A (Step 6 or 25) be Normal Operating Static Pressure /dOO #5/ (Step 8 or 27) N G

C) Set Point /, 2, 7 O c_ (Step 9 or 28) "'

Reset Point S S; 6 "p)c , (Step 10 or 29)

O D) me m ud b 24 Hour Test Begin: Time /OSD Date /Z-#-B6(Step 12 cr 31) 2' m

24 Hour Test End: Time /3', 2o Date fr.g-g6 (Step 13 or 32)

Normal Operating Static Pressure /6@pS/ (Step 13 or )

0:

k E) Set Point /, V, / 'sc (Step 15 or 34) p F) Reset Point 5~7.4'Wc (Step 16 or 35)

Lu

$ Static Pressure less than 25 PSIG (Step 18 or 37) PSI m l y G) Set Point G 2, 2. #uJc (Step 20 or 39) m H) Reset Point $;~6, 91/c (Step 21 or 40) 4 Hour Static Pressure kJk 8601-027 Influence Test Procedure .

K p.o. sox 591 11705 BLC'aos m l m a . m sAs 66064 m J _M

== Stau/ Ohs /controioeuces DATA SHEET FOR 8601-027 p}

Reference:

9 i 5 Switch Serial No. jp5 ./- 23ff Model No. joys.nz,z Oy- Jam g' E a

'2 Adjustable Range /-/co 'W c.

Pressure Gauge: M fg . 39 Model No. 2g5 qq-3 Esl 3 -TsMO T3 Serial No. $$D661e 3 d ,4.,

Differential Pressure Indicator: Mfg . %,e,5cru.o7- -

N Model No. Il 5~l D P 4 6 '2 - @

Serial No. #52.=f g '2.- [

Required Set Point 7,/,$ ,[NJL- N 4 inc. / Dec. l M

Normal Static (Operating) Pressure /s e o et/ '+"'

Data:

O Static Pressure less than 25 PSIG (Step 4 or 23)

N 6 PSI g

s .. sw -

A) Set Point I

13.'lOc (Step 5 or 24)-

B) Reset Point S 7, 5 " u.)C (Step 6 or 25)

Normal Operating Static Pressure /000 /51 (Step 8 or 27) E f C) Set Point 4 3,1 'W c (Step 9 or 28) -

D) Reset Point f6. 7 k) C , (Step 10 or 29) 24 Hour Test Begin: Time ts , gf Date (2.7-g (Step 12 or 31)

Z 5 24 Hour Test End: Time /s-lyo Date /2-V-#g, (Step 13 or 32)

I w Normal Operating Static Pressure / Coo raf (Step 13 or )

e 2 E) Set Point t,*g.B'ssc, (Step 15 or 34) p w

F) Reset Point 66.8 "Wc (Step 16 or 35) g Static Pressure less than 25 PSIG (Step 18 or 37) 6 PSI G) Set Point /,2, /, 5)c, (Step 20 or 39)

H) Raset Point 67. I 'Wc (Step 21 or 40)

,,,6 ..~ ...

24 Hour Static Pressure Influence Test Procedure

. M.

M...J/pg 8601-027 4 f[ p ,,,,,, ,,

. . . .