ML20081L700

Submits Summary on Comparison of Susquehanna & Shoreham Const Work Practices Re Snubber Stroking,Installation & Protective Actions to Preclude Damage Following Installation.Total of 230 Snubbers Stroked Satisfactorily

ML20081L700
Person / Time
Site:	Susquehanna, 05000000, Shoreham
Issue date:	01/21/1983
From:	James Smith LONG ISLAND LIGHTING CO.
To:	Higgins J NRC
Shared Package
ML20081L678	List: ML20081L689 ML20081L700 ML20081L708
References
FOIA-83-386 NUDOCS 8311160395
Download: ML20081L700 (5)

Text

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January 21, 1983 I

J. Higgins- (NRC) i Snubber Stroking SHOREHAM NUCLEAR POWER STATION - UNIT 1 W010-48923 On January 14th, R. Gallagher and myself spoke with R. Gallo l and yourself relative to the issue of Mechanical Snubber 3 Testing (refer to NRC Internal Memo from R.W. Starostecki

to D.G. Eisenhot dated June 8, 1982 - Item #7).

4 During our discussion, we indicated that LILCO Construc-tion Management had made a comparison of Susquehanna and Shoreham construction work practices with respect to snubber stroking, installation and protective actions to .

preclude damage following installation. A summary of -l this comparison is attached. In addition, LILCO has stroke tested a sample of thirty (30) Drywell snubbers (including all sizes) from a total of approximately two hundred thirty 7 (230) and all snubbers stroked satisf actorily.

In order to resolve this issue with I&E, LILCO has also committed to the following:

I l '. Ten (10) percent of the SecondaryLContainment '

snubbers (twenty (20) snubbers) will be stroke tested ~ prior to-fuel load (refer to attached matrix).

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2. Twenty (20) percent of the size snubbers will be [

included in the sample identified LinL Item 1. 1 1

3. All size snubbers will be stroke-' tested if=a failure is-detected in_this category.

4. Three (3) hydraulic snubbers willibe1 stroke tested. A miniiaum 'ofione (1) of-each size ~-is to be in: this . sample, (refer- to attached _ listing of hydraulic snubbers).-

8311160395 830829 PDR FOIA HAFNER83-386 PDR , -

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January 21, 1983 Page Two -

l J. Higgins (NRC).

Snubber Stroking

5. All International Nuclear Safeguards Corp. snubbers will be stroke tested. LILCO may choose to replace these snubbers with Pacific Scientific snubbers in which case the replacements would be stroke tested prior to installation.

6. LILCO has walked down the snubbers in the Drywell and believes that these snubbers are accessible for removal. However, we are initiating an addi-tional review of the large thirty-five (35) and one hundred (100) sizes to provide further assurance of their removal capability. This review will be conducted by the Maintainability Task Force supported by the UNICO Pipe Support group.

It is my understanding that these commitments will satisfac-torily resolve this issue. Work in these areas will commence in February and is anticipated to be complete by the end of March.

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J. L. Smith Manager, Specil Projects cc: M. A. Giannattasio R. Chung R. W. Grunseich R. Gutmann W. J. Museler 'F. Bellantoni W. Hunt R. Caruso (NRC)

R. Gallagher SR2 f

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_ Comparasion of Susquehana - Unit 1 Installation Procedure for Snubbers vs.

Shorehan - Unit 1.

1) Receiving inspection of snubbers by the Warehouse and Quality Control Group to include stroking and visual inspection. '

Shoreham Yes Susquehana Unknown

2) Available documentation for receipt inspection by the Warehouse and Quality Control Group.

Shoreh am Yes Susquehana No

3) Quality control inspection of snubbers during installation including a visual inspection for damage.

Shoreham Yes Susquchana No

4) Available documentation of installation inspection perfornied by Quality Control Group. . -

Shoreham Yes Susquehana No  :

5) Protection of snubber'after installation, a) Cardboard Covering.

Shoreham No Susquehana Yes b) Protective Covering with plastic and non-asbestos fire retardant wrapping (Refrasil).

Sh oreh am Yes Susqueh ana No c) /.ngle iron locking bar to secure snubber in place.

Shoreham Yes Susquehana _ No d) Warning signs to keep people from climbing on, scaffolding from, and rigging off snubbers. Signs placed at each snubber location.

Shoreham Yes Susquehana No

6) Available documentation of revision to snubbers during installation (rotating paddles , retorquing) .

Shoreham Yes Susquehana No

7) Pre-Fuel Load wrapping of all snubbers to inspect for any signs of visual damage.

Shoreham Yes Susquehana Yes O

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SECONDARY SNUBBERS PSA SIZE  :

SYSTEM TOTAL 1/4 1 3 10 35 100 B21 1 2 - -

2 -

5 Ell 5 4 6 23 4 -

42 E21 1 - -

2 - -

3 E32 4 1 - - - -

5 l

E41 5 5 2 7 6 -

25 l

E51 4 5 1 2 - -

12 13 Gil 8 5 -- - - -

G33 -11 11- 9 2 3 1 37 G41 -

3 -

2 - -

5 M41 -

1 -

1 P41 6 7 22 1 - -

36 ,

t TOTALS 45 44 40 -39 15 1 .184

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1 Hydraulic Supports in the Suppression Pool: .

B21-177 #2530 R/0 20 - 6" B21-178 #2510 R/0 20 - 6" j B21-179 #2510 R/O 20 - 6" B21-180 #2510 R/0 20 - 6" B21-181 #2510 R/0 20 - 6" B21-184 #2510 R/0 20 - 6" ,

B21-185 #2510 R/O 20 - 6" I

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i International Nuclear Safeguards Corp. used on M41 Systein in Yard Area:

M41-PSSP-800 MSVA-1 Type A M41-PSSP-801 MSVA-1 Type A M41-PSSP-802 MSVA-1 Type A M41-PSSP-803 MSVA-1 Type A M41-PSSP-804 MSVA-1 Type A M41-PSSP-805 MSVA-1 Type A

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