ML20038B991
| ML20038B991 | |
| Person / Time | |
|---|---|
| Issue date: | 11/01/1981 |
| From: | Jordan E NRC OFFICE OF INSPECTION & ENFORCEMENT (IE) |
| To: | Scott S NRC OFFICE OF ADMINISTRATION (ADM) |
| Shared Package | |
| ML20038B990 | List: |
| References | |
| NUDOCS 8112090398 | |
| Download: ML20038B991 (1) | |
Text
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UNITED STATES g
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NUCLEAR REGULATORY COMMISSION
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WASHINGTON. D. C. 20555
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SSINS #6820 NOV 1 19 81 MEMORANDUM FOR: Steve Scott, Chief, Document Management, Branch, Division of Technical Infonnation and Document Control, ADM FROM:
Edward L. Jordan, Deputy Director, Division of Resident and Regional Reactor Inspection, IE
SUBJECT:
OMB CLEARANCE OF DRAFT IE BULLETIN ADDRESSING GENERIC PROBLEMS ASSOCIATED WITH ELAST0MERS USED IN ASCO NP-1 VALVES The enclosed draft IE bulletin addressing generic problems with elastomers used in ASCO HP-1 valves is being forwarded for 0MB clearance. Also enclosed are the Supporting Statement prepared in accordance with Standard Form No. 83A, and the Headnote Statement.
An expedited review an'd clearance by OMB, within a week of their receipt of the draft bulletin, is requested to insure timely issuance 6f the bulletin.
It is expected.that you will forward this request to OMB within three working days so as to permit timely issuance.
p dward Jordan, Deputy Director Divisi of Resident and Regional Reactor Inspection Office of Inspection and Enforcement Er iosures:
1.
Draft IE Bulletin 2.
Supporting Statement 3.
Headnote Statement cc: w/ enclosures P. A. Wooley, OMB w/o enclosures V. Stello,.IE t
l J. H. Sniezek, IE A. W. Dromerick, IE R. L. Baer, IE l
I. Villalva, IE C0f7ACT:
R. L. Baer. IE 49-24780
'8112090398 811101 PDR REVGP NRCCRGR
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..SSINS No.! "6820 ACCESSION No.:
8107230034 IEB No.:
81-UNITED STATES NUCLEAR REGULATORY COM4ISSION OFFICE OF INSPECTION AND ENFORCEMENT WASHINGTON, D.C.
20555 October
,1981 l
l i
IE BULLETIN NO. 81- :
GENERIC PROBLEMS WITH ELASTOMERS USED IN ASCO NP-1 l
VALVES
Purpose:
The purpose of this bulletin is to inform holders of construction permit,s i
and' of operating licenses for nuclear power plants of potential safety problems.
involving the elastomers (Viton and ethylene propylene) used in ASCO NP-1
<alves and to supers 6de the recommendations in"INI InformatiorhNotice'No. 8d-l'1',
1 l
" Generic Problems With ASCO Valves in Nuclear Applications Including Fire j
Protection Systems" dated March-14, 1980, regarding the use of Viton components.
Background and Discussion:
IE Information Notice No. 80-11 includes a recommendati,on to replace the components made of ethylene propylene (EEi)M) elastomers in ASCO NP-1 valves withVitonparts.
The bases for the recomendation included the information contained in two letters,one from Mr. E. H. Crews, Jr., Vice President, South Carolina Electric and Gas Company to Mr. James P. O'Reilly, NRC, dated October 24, 1979; the other from Mr. J. A.
Dearien,
Manager, Code Assessment
,and Applications Program, EG&G to Mr. R E. Tiller, Director, Reactor Operations and Programs Division, Idaho Operations Office DOE, dated December 26, 1979.
Mr. Crews' letter identified the use of ASCO NP-1 valves with EPDM components
IEB 81-October
,~1981 Page 2 of at the Virgil C. Summer Nuclear Station (Docket No. 50-395) as a potential
~
significant deficiency because the. instrument-air system uses thread lubricants containing an oil base whic,h, if in contact with the EPDM components, would cause th'e EPDM parts to swell possibly causing valve failure.. Mr. Dearien's letter identified the major problem with solenoid valves as their incompati-bility with foreign materials and implied that the rga,jor contributor to their' failures had been oil contamination of the air'sy. stems.
Infomation received by NRC regarding the degradation of EPDM elastomers when exposed to oil (e.g., sticking, swelling,. closing flow paths) was, for the most part, based on the EPDM material being in direct contact with the con-taminated fluid..Such direct contact occurs in systens where the contaminated medium is the process fluid or in a'ir. systems laden with oil, such as may be found in shop air systems or service air systems. ASCO has informed us
~ that the pioper'use of petroleum-based thread lubricants as"a pipe sealant or anti-seize compund should not result in direct contact of the EPDM components with oil.. Nevertheless, since instrument air systems should be totally oil-free, ASCO recomends that petroleum-based thread lubricants not be used in instrument air systems.
The recommendation in IE-Information Notice No. 80-11 to replace the EPDM
-~ parts on ASCO NP-1 valves with Viton parts was based on the best available information at that time, including ASCO's certification that NP-1 valves with'Viton components were qua-lified for Class IE applications by having
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IEB 81- '
" October
, 1981 Page 3 of met.the requirements of the following IEEE standards:
(1) IEEE Std 323-1974, "IEEE Standard for Qualifyi.ngtClass. IE' Equipment for Nuclear Power Generating Station's;" (2) IEEE Std 382-1972', "IEEE Trail-Use Guide for Type Test of Class I Electric Valve 0perators for Nuclear Power Generating Stations;" and (3) IEEE Std 344-1975, "IEEE Recommended Practices ~
for Seismic Qualification of Class IE Equipment for Nuclear Power Generating Stations. "
Since the issuance of IE Information Notice No. 80-11, ASCO informed NRC
.by letter' dated July 10,1981 -(Attachment.1-) that its NP-1 valves with.Viton components are not qualified for certain nuclear applications. The ASCO P
letter destribes the results of recent tests which were conducted on its NP-1 valves with Viton parts to requalify said valves per the requirements of IEEE Std 382-1980.
In brief, -ASCO NP-1 valves with Viton parts failed.
~'
when exposed tothe radiatio'n levels stipulated in IEEE Std'382-1980, "IEEE Standard for Qualification of Safety-Related Valve Actuators" (a revision of IEEE Std 382-1972). Since the radiation levels stipulated in the 1972 and.1980 versions of IEEE Std 382 are very similar, neither NRC nor ASCO had reason to suspect that ASCO NP-1 valves with.Viton parts would not meet the radiation requirements.of IEEE Std 382-1980. ASCO cannot explain this apparent anomaly. Because of the aforementioned failures, SCO is notifying
-its customers (iee Attachment 2) that NP-1 valves with hiton parts should not be used in applications requiring them to shift positions following a total gama radiation exposure-in excess of 20 megarads.
l l. - -... -. -. -
IEB 81-October 1981 Page 4 of
. Act' ions to be Taken by Licensees:
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1.
Reyiew the des'ign of your facility and determine whether any safety-related ASCO NP-1 valves with Viton parts are used in locations where the total l
postulated gama radiation level to which they could be e.xposed, including both normal operation and postulated accid.ent conditions's exceeds 20 megarads. The suspect valves include those originally supplied with Viton parts and those which were subsequently modified by using the Viton kits listed in Attachment 3 or in the tabulation that foliows:
SPARE PARTS KIT NO.
CATALOG NO.
AC DC NP8344A70E 210-272 210-273 NP8344A71E 210-038 210-940
~
NP8344B46E 210-314 210-360 NP8344B58E
~' 210-926 210-928 If the above conditions do not exist, submit a negative declaration to this effect within thirty (30) days of the date of this bulletin.
Otherwise, replace the Viton parts with EPDM parts or other equally qualified parts as recommended by ASCO as soon as practicable but no later than during the next scheduled outage and submit a report describing the results of the review within sixty (60) days of the date of this bulletin.
The report should identify the suspect valves by system function and should include y6ur-proposed plans and schedule for replacing the Y
,--,,4
IEB 81-
" October
,1981 Page 5 of
'Viton parts.
If you do not propose to replace the Viton components, provide the bases for-such a decision in the report.
(NOTE: Since Viton components in NP-1 valves need not-be replaced if the total postulated radiation level to which they could'be exposed is 20 megarads or less, some NP-1 valves with EPDM components and others with Viton components could be used at the same facility.
In such cases,
, explicit controls of the spare parts should be implemented to assure' that Viton components are not used in locations where the total radiation exposure level could exceed 20 megarads).
- 2. 'In addition to the above requested actions involving ASCO NP-1 valves, it is recomended that you review the design of your facility and deter-mine whether other safety-related devices containing Viton parts are used 16 locations where "the total postulated gamma radiition exposure level, including both nonnal and p6stulated accidenYconditions, exceeds
~
20.megarads. No written response is required for this item; however,
.if applicable, you should evaluate the acceptability of using devices with Viton parts in light of Viton's low threshold to radiation damage.
Modifications resulting from such evaluation should be performed in =.
accordance with Section 50.59 of 10 CFR Part 50.
3.
Review the design of your instrument air system and determine whether
-it can become contaminated with oil (e.g., can the instrument air system Y
1 IEB 81-October
, 1981 Page 6 of be connected to non-oil free air systems).
If so, determine whether it serves any safety-related polenoid valves, irrespective of the manu-facturer, having EPDM gomponents or other elastomers having properties similar to those of EPDM. The principal concern is that.EPDM elas.tomers or other elastomers having similar properties would swell and lose strength.
~ hen exposed to oil, the'reby causing valve failu,re. No written response w
is required for this item; however, if applicable, you should evaluate the ef.fects of oil on the suspect valves. The evaluation should consider factors such as:
(a) symptoms which would permit an operator to promptly identify a failing or failed valve; (b) the effects of valve failures onsafety-relatedsystems;(c)requiredoperatoractions.toprecludeor ameliorate the. effects of valve. failures; and (d) the need for corrective actions such as revising procedures or modifying the design to assure that the instrument air system will not become contaminated with oil.
Modificatioris resulting 'from such evaluations should be' performed in accordance with Section 50.59 of 10 CFR Part 50.
Actions to be Taken by Holders of Construction Permits:
1.
Review the-design of your facility and determine whether any safety-related ASCO NP-1 valves with Viton parts are used in locations where the total gamma radiation level to which they could be exposed, including both normal and accident conditions, exceeds 20 megarads. The' suspect valves are identified in Item 1., above, in the section entitled " Actions to b'e Taken by Licensees'". -- -
I IEB 81-
' October
, 1981 Page 7 of l
If the above conditions do not exist, submit a negative declaration to T'
..this effect within sixty (60) days ofathe date of this bulletin but at least one week prior to the date by which you expect to receive an operating license. Otherwise, replace the Viton parts with EPDM parts or other equally qualified parts.as recommended by'ASCO as soon as practicable but prior to the date by which you expect to receive a full power operating
~
license. and submit a report describing the results of your review within
, one-hundred-twenty (120) days of the date of this bulletin but at lehst two weeks prior to the date by which you expect to receive any operating license. The report should identify the suspect valves by system function and should include your proposed plans and schedul'e fr ~ replacing the Viton ' parts.
If you do not propose to replace the Viton components, l
provide the based for such, a decision in the report.
(NOTE:
Since Viton components in NP-1 vIalves need not be replaced if
~
~
t the total postulated radiation level to which they cbuld be exposed is 20.negarads or less, some NP-1 valves with EPDM components and others i
with Viton components could be used in the same facility.
In such cases, 1
l explicit controls of the spare parts should be implemented to assure that Viton components are not used in locations where the total radiation exposure level could exceed 20 megarads).
6
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. ;.s IEB 81-October
, 1981 Page 8 of 2.
In addition to the above requested actions involving ASCO NP-1 valve's, it.is recommen'ded that you rev,iew the design of your facility and determine whether other safety-re, lated devices containing Viton parts are used' in Tocations where the total postulated gamma radiation exposure level, including both normal and postulated accident conditions, exceeds 20 megarads.
No written response is required for this item; however, if applicable, you should evaluate the acceptability of using devices with Viton parts in light of Viton's low threshold to radiation damage and make the necessary design changes.
3.
Review the design of your instrument air system and' determine whether' it can become. contaminated with' oil (e.g., can the instrument air system be connected to non-oil free air systems)'.
If so,detennine whether it serves any safety-related solenoid valves, irrespective of the manufacturer.
~
having~EPDM components or other elastome'rs having prope' ties similar to r
those of EPDM.
The principal concern is that EPDM ' elastomers or other elastomers having similar properties swell and lose strength when exposed to oil, thereby causing valve failure.
No written response is required for this item; however, if applicable, you should evaluate the effects of oil on the suspect valves. The evaluation should consider factors such as:
(a) symptcms which would permit an operator to promptly identify a failing or failed valve; (b) the effects of valve failures on safety-related systems; (c) actions required to preclude or ameliorate the~
sffects of valve faiiures;-and (d) the need for design changes.
IEB 81-
' October
, 1981 Page 9 of Provide written reports as requested above, signed u.ader oath or affirmation, under the provisions of Section-182a of the Atomic Energy Act of 1954. Reports shall be submitted to the Director o'f the appropriate Regional Office and a copy forwarded to the Director Office of Inspection and Enforcement, NRC, Washington, D. C.
20555
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This request for information was approved by the Office of Management and Budget under specific clearance number which expires i
Coments on burden and duplication should be directed to the Office of Management and Budget, Room 3201, New Executive Office Bulding, Washington, D.C.
20503.
t Attichment's:
1.
L'etter from W. M. Brown, ASCO, to N. Moseley, NRC,
Subject:
Viton Elastomers Used in ASCO Catalog NP-1 Valves, IE Infbrmation Notice 80-11 2.
Sample ~ASCOTetter to its Customers.
3.
List of ASCO Valves with Viton Elastomers
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and Viton Kits.
4.
Recently issued IE Bulletins.
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.Aniomaiic Swiich CD, Ag%.gQ FLo RHAM PARK, NEW JERSEY 07932
- N.J.-(201) 966 *000/N.Y.-(212) 344-3765
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July 10, 1981
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U...S. Nuclear Regulatory. Co'mmissionhihi.c j..N.'., ~
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Washington, D. C.
' Division of Reactor 'Operatiions0 Inspection:c.F.@
Mr. - Norman Mose' ley @;W.Directoms.';W.' "
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Office of. Insp'ectionj%$$i$:bM ::.L-~--Q:-W -d.+id.s-i.$&.- l4 cis.hdd
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Viton Elastomers. used4.'infASCO' Catalog. NP--1. Valves ; i.d.;g Sub:
IE Information Notice'-80-11E-F"
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Since your. issuance of the'sub-lectiIE!.Information Notice,'we have ~.M-
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conducted an additional qualifii:ation': test program on our Catalog;-
NP-1 solenoid valves, utilizing'.botE viton and ethylene propylene..;
clastomers to satisfy'IEEE 382--1980 c.and. new. customer requirements.;.c.-..
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,,. e During' this recently completed test program, we have experienced 'a 1 * -
problem with valves'containing.).'viton. elastomers.. The ' problem 9;' # -:. '.. '.
indicates that there is a potential c'ommon mode failure mechanism" for Catalog NP-1 ' valves ~ containing 'viton elastomers and that a.,, ? ' ~.
reduction in the level of qualification will'be necessary for'viton' Catalog NP-1 valves now in service which are required to shifti.
position and/or operate on demand following a DBE radiation exposure.
-s.
During the. baseline functional testing'which immediately followed the radiation DBE simulation.-(180 MRAD Gama Dose), it was discovered that the viton dynamic seals in the valves:under test adhered to the brass
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surfaces resulting in f'ailure' of the valves to shHt position..
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l In view of'these problems, it is our,'opinich that all plants utilizing viton elastomers in NP-1 valves should be notified of the possibility that these valves may not operate on demand -follow '-
ing exposure to high radiatio'n doses. >-
All testing which we have thus far conducted indicates that viton Catalog NP-1 valv'es will shift to their safety position at. the onset 'of an accident and will maintain a safety position during po'st-accident environments.
As a result of our current te't program, we will only certify viton s
valves to be capable of maintaining their safety function following an accident, i.e.,
they cannot be certified to operate on' demand following an accident.
l
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2-2 U. S. Nuclear Regulatory Commission
. July 10, 1981^
Testing cdnfirms thativalves'containing ethylene propylene elastomers will shift to their safety position and operate on demand during and following an accident'.: It is.our contention that ethylene propylene in the proferred elastoiner for niiclear ' power plant applications.
.)
Nh.i.;.w;../.i.:.gc..
Automatic Switch Company' feels obligated to. notify its customers of these most recent developments either-directly.or through the facilities of the NRC. "Thh'latter,'would'be preferable.since the primary' stimulus' to change'oier,t'o viton. equipped valves probably was
~
tha IE 80-11 notice.
If ASCO were'.to' issue information that contra-
'dicts the NRC notice, thisicould:causii' confusion.
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..r.., w.:., x,. s In any event,"we. feel thisi'nformatioi should be made public and
'would appreciate your timely response.to our proposal.
We are willing.
to su~pply you with any additional details and/or supporting da.ta you a,
., deem necessary to resolve this problein.
Perhaps you would like to visit with us to discuss this further.'
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UTOMATIC SWITCH COMPANY J.
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.B wn Sup,ervisor, Gov't & Nuclear Sales j
WMB:rl cc:
M. Colaneri
__W._. Duffy _.
H. Kaemmer J'. Shank D. Vollmer ASCO-Arlington R. Powell
Enclocura 2 Aiioniaic Switch Co.
.==aIFin1 Since 1888 h,.3 FLORHAM PARK.NEW JERhEY 07032 N.Jr(2011966-2000/N.Y.-f 2121344-3765 (SAMPLE ASCO LETTER) f
SUBJECT:
Purchase Order No.
Catalcg No.
Spare Parts Kit No.
Gentlemen:
Thank you for'your subject order.
Based on results from a recent extensive qualification test program (in acc.ordance with IEEE-382-1980) we do not recommend the use of valves' containing Viton dynamic seals on applications where the valves may be required to shift position following exposure to total gamma radiation doses in excess of 20 megarads, including the dose associated with a postulated DBE.
Valves containing Viton dynamic ' seals may still ce considered acceptable up to a 200 magarad total dose (including DBE) if they are not required to shift position after exposure to radiation doses in excess of 20 megarads.
We have found th'at Viton may slightly adhere to metal surfaces after exposure to large doses of gamma radiation.
This may result in failure of the valves to shift position.
Forthese applications. we recommend l
ethylene propylene (EPDM) elastomers.
However, please note that EPDM must be used in oil-free air systems.,,
Valves whose total gamma radiation exposure will not exceed 20 megarads, i
l including the dose associated with a postulated DBE, will be able to shift to a failsafe position at the onset of an accident and be capable of operating on demand.
For these applications, valves with Viton or EP.DM dutomers are sati_sfactory.
In view of the above, before proceeding with your order, we would suggest you review your system requirements to determine whether or not Viton elastomers are acceptable for your application.
l We will hold entiy of your order pending your instructions.
Very truly yours, AUTOMATIC SWITCH cob 1PANY l
l Au.oma.ic Swirca CD.
Me=am M
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S nce 1888 E-m_ _
FLORMAM PARK, NEW JERSEY 07932
- N.J 120 3 966 2000 /N.Y.4212)Jd4 3165 VALVE SPARE PARTS KIT NO.
VALVE SPARE PARTS KIT NO.,
BULLETIN NP8320 220-548 220-555 NP8321A1V 218-657 218-782 NP832057V NP832058V-220-584 220-591 NP8321A2V 218-657 218-782-NP832059V 220-5'49 220-555.
NP8321A3V-218-657
.218-782 NP832060V 220-585 220-591 -
NP8321A4V 218-657 218-782 NP832061V 220-550 220-556
~ NP8321ASV 220-165 220-166' NP832062V" 220-586 220-592 NP8321:A6V 220-165 220-166' NP8320637 220-546 220-553 NP8321A7V 220-165 220-16 6~
NP832064V 220-582 220-589
.NP8321A8V 220-165 220-166 NP832065V 220-547 220-554 NP832066V 220-583 220-590 BULLETIN NP8323 NP8320677 220-544 220-551 NP832068V 220-580 220-587' NP8323A19V 220-456 NP832069V 220-545 220-552 NP8323A20V 220-602 NP8320707 220-581 220-588 NP8323A21V 220-457.
NP832093V 220-546
~ 220-553 NP8323A22V 218-820 NP832094V 220-582 220-589 NP8323A23V 220-458,
NP832095V 220-544 220-551 NP8323A24V 220-604 NP832096V 220-580 220-587 NP8323A27V 220-459 NP8320A172V
.220-430 220-437 NP8323A28V 220-605 NP8320A173V 220-564 216-879 NP8323A29V 220-460 NP8320A174V 220-543 220-437 NP83.23A30V 218-821 NP8320A175V 216-881 216-87'9 NP8323A31V 220-461 NP8320A176V 220-543 220-437 NP8323A32V 220-607 NP8320A177V 216-881 216-879 NP8323A35V 220-456 NP8320A178V 220-432 220-438 NP8323A36V 220-602 NP8320A179V 220-565 220-568 NP8323A37V 220-457 NP8320A182V 220-424 220-439 NP8323A38V
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2-18-820
NP8320A183V 216.-883 216-882
'MP8323A397 '
220-458 NP8320A184V 220-424 220-439 NP8323A40V 220-604 NP8320A185V 216-883 216-882-NP8323A43V-220-459 NP8320A186V 220-424 220-439 NP8323A44V 220-605 NP8320A187V 216-883 216-882 NP8323A45V 220-460 NP8320A188V 218-817 218-819
~
NP8323A46V 218-821 220-461 NP8320A189V 220-566 220-569 NP8323A47V 1
NP8320A1927 220-435 220-441 UP8323A48V 220-607 NP8320A193V 220-567 220-570 l
NP8320A194V 218-818 220-441 j
1 l
NP8320A195V 216-878 220-570-NP8320A196V 218-818 220-441 NP8J20A197V' 216-878 220-570 NRH320A198V 218-818 220-441 NP8320A199V 216-878 220-570
^
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VALWE SlfARE PARTS KIT NO.
VALVE
@MLCbthkFt9MRN yCATALOG NO.
AC DC BULLETIN NP8344 BULLETIN NP8316
- (CON'T)
NP8344B46v 220-679 220-681 NP831654V 218-786 218-658 NP8344B46VMO 220-680 220-682 NP831654VMO 218-788 218-789 NP8344B50V 220-688 220-690
'NP831655V 216-880 216-877-218-802 NP8344B50VMO 220-689 220-69L NP831655VMO 218-801 NP8344B52V 220-688 220-690' NP831656V 218-790 218-780 NP8344B52VMO 220-689 220-691 NP831656VMO 218-791 218-793 NP8344B54V 220-696 220-698
.NP831657V 218-803 218-80?
NP834~4B54VMO 220-697 220-699 NP831657VMO 218-805
'218-806 NP8344B56V 220-696 220-698 NP831664V-218-786 218.65G NP8344B56VMO.
220-697~
220-699 NP831664VMO 218-788 218-789 NP8344B58V.
220-674 2'18-000 NP831665V
'216-880 216-877 NP8344B58vMO_
220-675 220-676' NP831665VMO 218-801
.218-802~
NP8344B62V 220-700-220-701 NP831666V 218-790 218-780 NP8344B62VMO 220-701 220-703 NP831666VMO 218-792
' 218-791 NP8344B64V 220-700 220-702 NP831667V 218-803' 218-804 NP8344B64VMO 220-701 220-703 NP831663VMO 218-805 218-806 NP8344B66V 220-708 220-710 NP8316A74V 218-786 218-658 NP8344B66VMO 220-709 220.711 NP8316A74VMO 218-788 218-789 NP8344B68V 220-708 220-710
.NP8316A75V 216-880 216-877 NP8344B68VMO 220-709 220-711 NP8316A75VMO 218-801 218-802 NP8344A70V 220-541 220-603 NP8316A76V' 218-790 218-780 NP8344A70VMO 220-606 220-669 NP8316A76VMO 218-792
.218-793 NP8344A71V 220-5'40 220-714' NP8316A77V.
218-803 218-804 NP8344A71VMO 220-713 220-715 NP8316A77VMO 218-805 218-806 NP8344A72V 220-664 220-665 NP8344A72VMO 220-666 220-667 BULLETIN 206-380 NP8344A73V 220-780 220-782 NP8344A73VMO 220-781 220-783 206-380-lRVF 220-309 NP8344A74V 220-664 220-665 206-380-lRVG 220-312 NP8344A74VMO 220-666 220-667 206-380-lRVU 220-315 NP834,4A75V 220-780 220-78.2 206-380-2RVF 220-309
[
NP8344A75VMO 220-781 220-783 206-380-2RVG 220-312 l
NP8S44A76V
_ 220_-662 220-660 206-380-2RVU e 220-315 1
NP8344A76VMO 220-663 220-661 206-380-3RVF 216-886 NP8344A77V 220-479 220-786 206-380-3RV.G
- 216-887 NP8344A77MO 220-785 220-787
.206-380-3RVU 220-316 NP8344A78V 220-662 220-660
'206-380-4RVF 220-309 l
NP 8344 A78VMO - 220-663 220-661 2064380-4RVG 220-312 NP8344h797'-~
22'0-479 220-786 206-380-4RVU 220-315 NP8344A79VMO 220-785 220-787 206-380-5RFV 216-886 206-380-5RFG 216-887 BULLETIN NP8316 206-380-5RV 220-316 206-380-6RVF 220-311 NP8316E34V 218-490 218-491 206-380-6RVG 220-314 NP8316E34VMO 218-496 218-501 206-380-6RVU 220-317 NRg316E35V 218-791 216-876 206-380-7RVF 220-311 NP8316E35VMO 218-783 218-784 206-380-7RVG 220-314.
NP8316E36V 218-502 218-507 206-380-7RVU 220-317,'
NP8316E36VMO 218-508 218-513 NP8316E37V 218-787 218-791 NP8316E37VMO, 218-799 218-800
VALVE M N ET 50.
CATALOG NO.
~
'220-310 206-381-lRVF 220-352 206-381'lRVG 216-884 206-381-lRVU 220-310 206-381-2RVF.
220-352 206-381-2RVG 206-381-2RVU
~
216-884 206-381-3RVF' 220-353 220-354-206-381-3RVG 218-638.
206-381-3RVU 2 20-31.0 ^
206-381-4RVF 1220-352 206-381-4RVG 216'-884
. 206-381-4RVU 220-353 206-381-5RVF 220-354 206-381-5RVG 218-638 206-381-5RVU 220-313
'206-381-6RVF 220-356 206-381-6RVG 216-885 206-381-6RVU 206-381-7RVF' 220-313 220-356 206-381-7RVG 216-885 206-381-7RVU BULLETIN 206-832 206-832-lRVF 220-309 206-832-lRVG 220-312 206-832-lRVU.
220-315 206-832-2RVF 220-309 206-832-2RVG 220-312 206-832-2RVU 220-315 206-832-3RVF 216-886 206-832-3RVG 216-887 20&-832-3RVU.
220-316
- 206-832-4RVF 220-309 206-832-4RVG 220-312 206-832-4RVU 220-315 206-832-5RVF 216-886' 206-832-5RVG -
216-887 2
~-
'~
206 BT2-5RVU~
~~220-316 l
~
l 206-832-6RVF 220-311 l
206-832-6RVG 220-314 206-832-6RVU 220-317 l
'206-832-7RVF 220-311' 206-832-7RVG 220-314 206-832-7RVU 220-317. -
~
t
.s_
August 11., 1981 e
I
..