ML19330B860

Part 21 Rept Re Testing Failure of safety-related Pressure Switches in Toxic Gas Monitors for Chloride.Dwyer Instruments,Inc Notified of Potential Defect & Safety Analysis Requested

ML19330B860
Person / Time
Site:	Palo Verde, Brunswick, Limerick
Issue date:	07/20/1980
From:	Denenburg B, Gutman D MDA SCIENTIFIC, INC.
To:
References
REF-PT21-80-259-000 NUDOCS 8008070087
Download: ML19330B860 (3)

Text

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PNE 21 IIBEIFICATION N0..'. W -39 ~

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IATEOFifTTER. %o/ F e D00(ET 10. 5'o-Sa&; re- u a DATEDISTRIBUTED '/ n/ea ORIGIIRL EPORTg StPPlDENTARY DISTRIBUTION:

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VENDOR BR, R-IV . _ VENDOR BR. R-IV VENDOR BR R-IV LOEB / IPA MB 5715( NIES / FCMS- SS-395 NRR/ DOL AE0D MiB 7602 - LDEB / MPA MiB 5715 NMSS / SG SS-881 NRR/ DOE AEOD MB 7602 L0cB / FPA M B 5715 NRR/DSI CENTPALFILES 016 AEOD MB 7602

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PRELIMINARY EVALUATION OF THE ATTACHED REPORT INDICATES LEAD RESPONSIBILITY FOR FOLLOWUP AS SFOWN BELOW:

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_i ~ ~Mr. James G. Keppler, Director, Region. IIIh, _ . , _ , .- _,

Office of Ynspection and Enforcement

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U. S. helaar Regulatory Commission

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Subject:

75ieporting of poEend.Alideficiency in accordance with Parastaph

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. T- i f . . "f ?. Clenview, IL 60025' Byron A. Denenberg,. President and'C.O.O.

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l 17- Donald L. Cutman, Quality Assurance Manager

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. Supplied.To: Bechtel Power Corporation

. Arizona Tublic Service' Palo verde Pro.iect The Philadelphia Electric Company  !

Limerick Project i Components:- Supplied by: Dwyer Instrument Michigan City, IN ,

0" - 1" W. G. Minitactor Pressure Switch Gentimmen: ,

In order to comply with Section 206 of the Energy Reorganization Act of 1974,

.rhe following information is submitted:

1. MDA Scientific supplies a toxic gas monitor for chlorine to meet D. S. RRC Ouide 1.95.

l '2. Included as a component in this instrument is 0" - 1" W. G.

. pressure switch.

3. The pressure switch is considered safety related.

L 4. The chlorine monitor has been environmentally and seismically .

l tested in accordance with IEEE 323-74 and 344-75 utilieing - .

Dwyer Instruments pressure switch.

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5. The above testing was completed in' July of 1979, without )

incident in regard to pressure switch functional failure. .

6. In November of 1979, four (4) units were shipped to the l Limerick jobsite, and December' of 1979, four (4) units were shipped to the Palo Verde jobsite, with these pressura switches installed and functioning. . . ~

7.' ;The' remaining pressure switches of a ;(50) piece order was;. . _ .

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placed in MDA stock for future usa.c. -

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[.- 8. :In March of'T980, four (4)' pressure switches were requi-j

.- sitioned from stock for use. .Two (2) of the four -(4) switches failed to perform a repetitive functional;tast i a .. .;_.

prior to iratellation. The remaining stock was requisi- . .

j E. --i Eff - 3+ tiened by fMality~ Control for testing, and seven (7) ? j e._ .;

additional witches failed cyclic testing. The rejection ' " -

rata was not'significant and the switches were returned to

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9. Approximately-thirty (30) days later; the switches were

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removed from stock by Quality Contro14and retested. i Five. , .

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(5) of the remaining switches failed' cyclic tant. The l rejection rate became significant and the remaining stock was removed to a non-conforming area and all . projects involved were notified.

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10. Dwyer Instruments, Inc. was notified of the potentisi defect and a failure analysis ws.s' requested. l

11. Dwyer is to provide failure analysis as soon as available. l

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12. Corrective action implemented to prevent the une of these l

switches by MDA Scientific is as follows:-

a. The Bechtel Palo Verde and Limerick projectc have been notified and the potential defect identified.

b. All pressure switches (Dwyer) have been returned to the manufacturer. .

c. A new pressure switch, sith a 0 -: .5 W. C. activation point has been purchased from Fairchild, Long Island, Eew York.

d. Cyclic testing has been completed by MDA Scientific of

. the switches and are acceptable.

e. .The Fairchild pressure switch shall be qualified by i Wyle Laboratories, Norco, California.

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f. On completion and qualification of the Fairchild switch, -

both Bechtel projects will be notified with inst.vetions

-for,repiscement of these components.

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7- U. S. Nuclear Regulctory Conniccion W- July 20, 1980 '* F*E' 3 s *

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If additional information:is required, we may be contacted between 8:30 a.m.

7. and 5:00 p.m. at 312/998-1600. -

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