ML19350C240

Interim Deficiency Rept Re Design Interferences in Bergen Paterson Pipe Support/Shock Arrestor Assembly Used to Support 8-20 Inch Pipe Sections.Caused by Vendor Failure to Notify Users of Revisions

ML19350C240
Person / Time
Site:	Wolf Creek, Callaway
Issue date:	03/17/1981
From:	Seiken S STANDARDIZED NUCLEAR UNIT POWER PLANT SYSTEM
To:	James Keppler, Seyfrit K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III), NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
References
10CFR-050.55E, 10CFR-50.55E, 81-015, NUDOCS 8103310671
Download: ML19350C240 (12)

Text

,.,

SNUPPS Standardised Nuclear Unit Power Plant System March 17,1981 S No Cherry Road Z'l$fo'*""#"'

SLNRC 81- 015 FILE: 0491.10.2/M-218A SUBJ:

Interim Report on Bergen Paterson Support Strut Assemoly Design Inter-ference: Report No. 81-1 Mr. James G. Keppler Director, Region III Office of Inspection and Enforcement g fN,;,

U.S. Nuclear Regulatory Comission

/f m 'v 79s' Roosevelt Road v

Qv p Glen Ellyn, Illincis 60137 g

0 Mr. Karl Seyfrit 5

g[

fi Director, Region IV

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U.S. Nuclear Regulatory Commission

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e Suite 1000, Parkway Central Plaza b

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A' 611 Ryan Plaza

/i 3 Arlington, Texas 76012 Gentlemen:

On Feb. 13, 1981, NRC Region I (Cerne) was informed by the SNUPPS Quality Assurance Manager (Seiken) of design interferences in the Bergen Paterson pipe support / shock arrestor assembly used to support 8"-20" size pipe sections. Subsequent examination has reaffirmed the need to advise the NRC of these interferences pursuant to 10CFR50.55(e) regulations.

It must be noted that this is the second instance in recent months of design interfer-ences involving Bergen Paterson supports. An earlier report was forwarded to Region I last November; Ref. SLNRC 80-53 dtd. 11/26/80.

Enclosed with this letter is an interim report covering the design inter-ferences in the 8ergen Paterson-furnished assemblies.

The enclosed report is being treated as a generic repor.t applicable to all SNUPPS units. A final report is anticipated by June 1, 1981. This date has been established in recognition of the recurring design difficulties which have been exper-ienced with the Bergen Paterson units and the need to assure that corrective actions taken are fully effective in resolving this matter.

In the interim, please address any questions to the undersigned.

Very truly yours, S

((/

S. J. Seiken Q.A. Manager SJS:dck:6b2 Attachment cc:

G. L. Koester, KGE J. Konklin, NRC Region III

0. T. McPhee, KCPL T. Vandel, NRC Wolf Creek J. K. Bryan, UE Victor Stello, Jr., Director, Office of W. Hansen, NRC/Callaway I & E, USNRC, Washington, D.C.

810 3 310 fa7/

,5

4 1

i 4

10CFR50.55(e) 1 on POTESTIAL PIPL CLAMP - BRACKET 1h7ERFERENCE BERGEN - PATERSON PIPE SUPPORT STRUT ASSEMBLY with MECHANICAL SHOCK ARRESTOR SUPPLIED by PACIFIC SCIEhi1FIC I

to SNUPPS UNITS Bechtel Power Corporation Gaithersburg, Maryland i

March 12, 1981 4

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FGg2 1 cf 3 10CFR50.55(e)

Bergen-Faterson TABLE OF CONTE.IS V

1.0 Introduction 2.0 Description of Reportable Deficiency 3.0 Analysis of Safety Implications 4.0 Corrective Action Attachment #1 Attachment #2 4

UEO E4 N

.m.-.m_

m

Pcgo 2 cf 3 10CTR50.55(o) R:ptre Berg:n-Patcreen

1.0 INTRODUCTION

In accordance with the require =ents of 10CTR50.55(e), this report is prepared to provide a summary of a generic deficiency related to pipe clamp to bracket interference which could hinder the full function of Bergen-Paterson pipe support strut asse=blies containing Pacific Scientific mechanical shock arrestors. Presently, the pipe support assemblies are designed to provide a 12* cone of movement to accommodate thermal and seismic loads.

In hanuary 1977, Pacific Scientific (PSCo) revised forward brackets (PSCo Parts 1801599-03 and 1801597-03) which reduced the available di=ensions between the bracket face and the bearing hole center (see Attachment #1). This revision was not identified in the PSCo Snubber Design Book issued to Bergen-Paterson and other users until late February 1981 (See January 1981 revision, attach =ent #2)

This reduced "Take-Out" di=ension, when maxi =u: tolerances are used creates an interference between Bergen-Paterson parrs 2640 and 2541 sizes 6 and 15 pipe cla ps and the PSCo brackets. Under these circumstances the 12' !' cane" of movement may not be achievable, and could, in so=e instances, result in overstressing of the piping co=ponent.

This deficiency was verbally reported to the NRC Region 1 Office et Inspection and Enforcement by SNUPPS on February 13, 1951. The Region I Of fice agreed to notify Regions III and IV of this probles.

Bergen-Paterson filed a 10CFR Part 21 repert with the NRC on March 6,1981 and has urged Pacific Scientific to inform their customers of potential interferences resulting from these dimensional changes.

A list of identification numbers of the assemblies centsining the potential interf erence shipped to the SNUPPS sites has been co: piled and the jobsites notified accordingly. Thi asse=blies each jobsite have been placed on hold. Pipe clamps Isr these sizes atin canufacture at Bergen Paterson are being modified to eli=inate the potential for interference.

2.0 DESCRIPTION

O' REPORTABLE DEPTCIENCY The Bergen-Paterson snubber assemblies being supplied to the SNUPPS sites e= ploy a Bergen-Paterson 2640 pipe cla:p in combination with a i

Pacific Scientific and bracket asse=bly. Many of these snubber asse=blies are ecployed in safety-related piping systems.

The part 2541 snubber assemblies in question contain an interference between the pipe clamp and end bracket assembly which does not permit the required thermal and seismic move = Gut of supported pipe sections.

i 4

=

4 10CTR50.55(e) Report Page 3 of 3 Bergen-Paterson 3.0 ANALYSIS OF SAFETY IMPLICATIONS Snubbers that are employed in seismically designed piping systems must permit the pipe to move thermally in the direction of the support and provide a rigid restraint during a seismic event. The snubber must also permit notion of the piping transversely perpendicular to the end brackets.

This is acheived by allowing a 12' cone of travel at both ends of the 1

snubber, utilizing ball bushings.

The snubbers in question permit less than the full 12* cone specified in Bergen-Paterson's Load Capacity Data Sheets. The restriction of pipe movement.could cverstress the pipe. The action of the cla=p locking up with the snubber body could also over-stress the snubber during piping movement.

4.0 CORRECTIVE ACTION The interference in~these snubber assemblies has been attributed to:

1.

PSCo's failure to notify. users when dimensions of its f orward brackets were revised.

2.

Bergen-Paterson f ailed to identify _ this revision during incorporation of brackets into these assemblies.

Bergen-Paterson has initiated dimensional inscection of PSCo parts uoon receipt to confirm conformance to critical dimensions as described in

+

l-PSCo's Snubber Design Book.

All assemblies supplied after March 4, 1981 will include clamp nodification to eliminate any interference.

Modified clamps are being sent to the sites to replace those identified as defective. No further shipments of complete assemblies of the affected sizes will be made until the Architect / Engineer has confirmed that the committed corrective action has been taken.

The Architect / Engineer will visit Bergen-Paterson to review the vendor's translation of specificatien requirements into design documents, and will take further appropriate ceasures to confirm the. adequacy of the Bergen-

~

Paterson pipe support design.

In addition, the adequacy of manuf acturing controls being exercised over. pipe support f abricatien vill be evaluated and appropriate remedial action will be f=plemented. A meeting with Senior Sergen-Paterson Management will be scheduled shortly to define and implement necessary design ~ verification actions. A finah report, based upon these evaluations, vil2 be furnished to NRC on or Aefore

-June 1, 1981.

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ATTACHMENT #1

SUMMARY

OF PSCo FOREWARD BRACKET "TAKE-0UT" DIMENSIONS PART #1801597-03 M

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~

x i

1.65" ;ake-out c

- 1.50" take-out M

1/77 and 4/B0 revisions 1/81 revision l

PART f1801599-03 I

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l

+

c

- 1.56" take-out

+

c 1.30" take-out 1

1/81 revision 3/76 and 4/80 revisions All dimensions extracted from PSCo drawing information NOTE:

1801561 41 -

<3C INSTRUCT!ON'

[_ ?, W,-

SilEET

.?A l[

T 1801603-01 BOLT 4REOD

.875-

.531 DIA THRU 1*000 -

4 PLACES 1801483-01 j

g SPilERICAL

~

? } [1.0000 *.3 DIA DEARING.

f

~

12* ALLOWAOLE 3.625

(-

8-T MISALIGNMENT

~ ~ U~

\\

1801596-03 9

4 BRACKET, FORWARD

.75

-- f0 4

- 2.4 0 --

6.00 1.00 X 45* TYP-SO

- 3.90 -

4 5

_Q k

3 MATERIALS:

DOLTS - PSCO 12.08 Ed

!) EARING - CORROSION RESIS-TANT STEEL ORACKET - PSCo 12.03 & 12.06 2 FINISilES - ELECTRO PLATED ZINC PACFIC SCIENTEIC

• ^'*" C^

i 1 ALL DIMENSIONS ARE NOMINAL EXCEPT TilOSE Willi LIMITS FORWARD DRACKE wi6E psA io'~'~

INDICATED.

om,,,,l 1801597-i NOTES i

'a 1901561 01 sp INSTHUGTION.

StiEET Q

1801603 01 DOLT 4 ItEOD

.800 -

.531 DIA THHU 1.000 -

4 PLACES 1801483-01 1.0000 *.'"' DIA DEAGING

~

~ [~

%-)

'li)

SPitEHICkt e

a

-Q, MISALIGNMENT

_ _{}_

F12* ALLOWABLE 3.625 T-

~

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1801596-03 41) 4 c._

DHACKET, FORWARD

.75 4.500___

-2.40-SO 6.00 1.00 X 45* TYP-SO

- 3.90 -

A x

A l

P3 k4 3 MATERfALS:

p pa DOLTS - PSCo 12.00 DEAntNG - CORROslON DESIS-4 TANT STEEL BRACKET - PSCo 12.03 a 12.06 i

l 2 FINISifES - ELECTHO Pl.ATED ZINC i

1 At.L DIMENSIONS AHF. NOMINAL E Yu,8((" N EXCEPT TilOSE Willt LIMITS FORWARD HHACKET i

INDICATED.

i 90gn3 poon. I'pAA. 1801597-03

~!ur(~'*"'"

l

..q g,

1801561-01 '.. '

INSTRUCTION SitEET t

k 1801603-01 BG.T I

.000 4OEOD

-.750 j

531 DIA TtIRU\\ g.000 7

4 PLACES 1801483-01

.=

I-DIA REARING.

]I -}-

., (),

)

SPilEHICAL -

I

()

' 12* ALLOWADLE

.(

cd C _L_.. MISAllGNMENT

(

_-._.. 7-i-

i I

t (\\l I l V}:

~.

DRACKET FORWARO c

').

'I m

3.67 -

FULL R -- /

- 90 MAX 4.500 _

-2.&

SO 6.00 SO

~ 3.P pg 4

-4 %

%.t<wcs :1o.010

~ 7,,

4 j 'i rce P5C.

g4 i

l 3 MATERIALS:

Dp BOLTS - PSCO 12.08 l

DEARING - CORROslON RESIS-TANT STEEL BRACKET - PSCo 12.03 & 12.06 1

2 FINISilES - ELECTI',0 PLATED ZINC PACFC SCENTFC 1 AlL DIMENSIONS ARE NOMINAL ANAllt en( CA 97803--

EXCEPT TilOSE WITH LIM 11S FORWARD BRACKET J

INDICATED.

uotRL PSA H) 1801597-03 NOTES

.,.. I -r = a =

1 I

i

-5 %

380158,.o, j

INSTRUCTION SHENT.

.346 DIA THRU 4 PLACES k

1801604-01 BOLT

.625 4 REOD

.750 1801482-01 DEARING

[.7 500 *."' DIA

- ge-

+

SPilERICAL

~

r n}MISAllGNMENT 12* ALLOWABLE

~ Y' ~

l

~

~

2.75 q-h1:$01596-03 g

4 ERACKET, FORWARD 3.750 -

.50 X 45* TYP-

.44 SO

- 2.00

~5.00 SO~

- 3.25-i V

yy I

J 3 MATERIALS:

DOLTS - PSCO 12.08 p

i DEARING - CORROSION RESIS-k*

TANT STEEL

((

BRACKET - PSCo 12.03 & 12.06 19 2 FINISilES:

ELECTRO PLATED ZING

(

l 1 ALL DIMENSIONS ARE NOMINAL gaggsqw;74 c

I EXCEPT TilOSE WITil LIMITS FORWARD DRACMT INDICATED'

... _..n...,...1.1amsa

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NOTES

_-----y_.---

1801581 41

\\~.-

,@h<j INSTI1UCT10N SHEET i

.346 DIA THt10 I

4 PLACES l

E

.600 1901604-01 bot.T 4 flEOD

.750 1901482-0f.

e flEAfilNG

-N

[*

-k

+

SPIIEHICAL f

}

^

2 75 %

' "~ -

MISAllGNMENT i

T N1 0,50. 3 s

l

+

+

f BRACKET, FORWARD

~ 3.750

.50 X 45' TYP-

.44 SO

- 2.M f

-5.00 SO-

-- 3.25-l Mgn i

3 MATERIALS:

rOLTS - PSCo 12.06 q}1 DEARING - COOHOSION FIESIS-g$,

TANT STEEL V 4 BRACKET-PSCo 12.03 & 12.06 6' rc 2 FINISHES:

ELECiRO PLATED ZINC 1 ALL DIMENSIONS AHE NOMINAL cacre scemsnc EXCEPT TiIOSE WlilI LIMITS

• ?.5 8 '!"#

IN9ICATED.

FOnWARD DHACKET NOTES

_ oigt psa 3..... F'

~

1801599-0:

. ~

[@hj

~

1801561-01 j

INSTHUCTION SHEET

.346 DIA THRU. 750 DIA SPOTFACE 4 PLACES 4

.600 1801604-01 BOLT

((

f 4 HEOO

.750 1801482-01 I #

HEARING

[ N 'E UA

( 3 '.

-(. Td, SPHEnlCAL

- IC i

)_

L

• ALLOWABLE eg 12 T IN MlSAllGNMENT

~

~

~

~

M h 's.'.' l " -

2.82-

'. \\-1801598 43 I

1-

~

BHACKET, FORWARD

~ 3.7 Full. R -

• 50 4 PLACES f

g0

--.70 MAX

~5.00 SO-

- 2.00

=

=

1'

+ 3.375 m Tes.ES& Weit T O.ci 6 !

3 MATERIALS:

BOLTS - PSCo 12.08 YET-DEARING - CORHOSION RESIS-TANT STEEL BRACKET - PSCo 12.03 & 12.06 2 +1NISHES:

ELECTRO Ft.ATED ZINC 1 ALL DIMENSIONS ARE NOMINAL EXCEPT THOSL' WITil LIMITS m u g c4,2.o3 m[S FORWARD BRACKET t ATED.

...,,.. l.',' 8 ^1801599-03 "L

n n..