ML20155B697

Forwards Response to Request for Addl Info Re First 10-yr Interval Inservice Insp Program

ML20155B697
Person / Time
Site:	Seabrook
Issue date:	06/03/1988
From:	George Thomas PUBLIC SERVICE CO. OF NEW HAMPSHIRE
To:	NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM)
References
NYN-88078, NUDOCS 8806130297
Download: ML20155B697 (12)

Text

_ _ _ _ _ _ _

^t George S. Thomas Vice President Nucleor Produchon NYN-88078 gg N;w Hampshire Yankee Division June 3, 1988 United States Nuclear Regulatory Commission Washington, DC 20555 Attention:

Document Control Desk

Reference:

(a)

Facility Operating License NPF-56, Docket No. 50-443 (b) USNRC Letter, dated April 4, 1988, "Request for Additional Information - First Ten-Year Interve.1 ISI Program, Seabrook Station Unit 1," Mr. V. Nerses to Mr. R. J. Harrison

Subject:

Response to Request for Additional Information - ISI Program

Dear Sir:

In response to Reference (b), en:losed please find the New Hampshire Yankee response to each item.

Should you require any additional information regarding this matter, please contact Mr. Robert A. Gwinn at (603) 474-9574, textension 4056.

Very trvly yours,

.4Hh Georg S. Thomas Enclosure cci Mr. Villiam T. Russell (w/o drawings)

Regional Administrator Region I United States Nuclear Regulatory Coc=tission 631 Park Avenue King of Prussia, PA 19406 Mr. Victor Nerses Project Manager (w/o drawings)

Project Directorate I-3 Division of Reactor Projects United States Nuclear Regulatory Commission Washington, DC 20555 Mr. A. C. Cerne (w/o drawings)

/

NRC Senior Resident Inspector f,

Seabrook Station Seabrook, NH 03874 l

8"O6130297 880603

0. Seabrook, NH 03874. Telephone (603) 474-9574 PDR ADOCK 05000443 0

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Item 2A Provide the staff with the Boundary Diagrams which define the ASME Code Class

1. Class 2 and Class 3 boundaries for the systems in the Seabrook Station, Unit 1 First 10-Year Interval ISI Program Plan.

Response

Attachment A to this enclosure provides the drawings listed in Table 6 of the ISI Program Plan.

These Piping and Instrumentation Diagrams (P&ID's) designate the Code Class 1, 2 and 3 lines and boundaries.

Item 2B Provide isometric and/or component drawings showing the welds, components and supports which Section XI of the ASHE Code requires examination.

Response

Attachment B to this enclosure provides an index and the ISI drawings showing welds, components and supports in the ISI Program Plan.

Item 2C Provide a list of the calibration standards referenced in paragraph 4.2 of the ISI Program Plan which will be used during the first 10-year interval ISI at Seabrook Station, Unit 1.

This list should include the calibration standard identifications, material specifications and sizes.

Response

Attachment C to this enclosure is a two page list of calibration blocks that will be used during the first 10-year interval ISI.

A description, ID number and material is shown for each calibration block.

Item 2D The ISI Program Plan, Paragraph 7.6, states:

'The selection of one from the group of pumps for examination, both volumetric and visual, will be deferred until required pump maintenance necessitates disassembly'.

Confirm that the Code-required examinations will be performed during the interval or that relief will be requested at the end of the interval if the Code-required examinations have not been completed.

Response

The Code-required examinations will be performed during the interval.

Paragraph 7.6 is intended as an explanation for not choosing a particular pump and period within the 10-year interval in which to perform the examinations.

Disassembly for maintenance will provide this determination.

Item 2E Request for Relief IR-4: With regard to the following Steam Generator nozzles, provide further information (i.e. drawing or sketches) showing the typical configuration of the nozzle inner radius sections and/or surface conditions which prohibit performing 100% of the Code-required volumetric examinations.

Nozzle ID 1-RC-E-llA-16IR 1-RC-E-llB-16IR 1-RC-E-llc-16IR 1-RC-E-llD-16IR 1-RC-E-11C-llIR

Response

Attachment D to this enclosure is a drawing of a portion of the Steam Generator vessel showing the steam outlet nozzle (i.e. 1GIR). As shown, the configuration of this nozzle makes the inner radius ultrasonic examination impractical.

Nozzle inner radius on 1-RC-E-llc-llIR does not represent a configuration problem but rather a surface condition. Attachment D also shows the examination set-up utilizing the required 70 degree skew angle in which surface roughness prohibited examination.

Item 2F Request for Relief IR-5:

Relief is requested from performing a 1002 volumetric examination on seven 6-inch Code Class 2 branch connection welds due to permanent obstructions that restrict volumetric examinations.

It is noted that neither 83S83, Examination Category C-F, Item C5.30, nor the alternative rules of Code Case N-408, Examination Category C-F-2, Item C5.81, require volumetric examinations of these branch connections.

Based on the above, provide additional information with regards to why relief is requested for these welds.

Response

It is correct that volumetric examination is not required for branch connections of this size under the stated rules.

The Seabrook FSAR commits to augmented ISI of main steam and feedwater piping which consists of 100Z examination of the longitudinal and circumferential welds. As depicted in I

Attachment E to this enclosure, these connections on the main steam header are not the normal 6' tee fitting but rather a sweep-o-let.

Since these fittings represent a large weld area on the main header, a conservative judgement was made during PSI to include these welds under Examination Category C5.81.

(

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Our relief is requesting variance due to geomotric configuration, permanent obstructions and/or structural interferences on 100Z examination for these welds which are being conservatively examined under C5.81.

Item 2G General Connent: The proposed alternative examinations and justifications, used by the Licensee for all requests for relief, are based on the subject welds having received ASHE Code Section III volumetric examinations and hydrostatic tests.

Examinations performed during construction ensure the structural integrity during PSI and initial operation. The results from the PSI provide base line information that may indicate the expected extent of inservice examinations.

Inservice inspections are intended to detect service-induced degradation.

When limitations to specific Code-required inservice inspections are identified, other Code-required examinations are not alternatives. However, the staff may. consider the measures that can be accomplished and other requirements when assessing the acceptable level of quality and safety.

Response

Any relief requests that may be generated in the future shall consider different alternatives when limitations to specific Code-required examinations are identified in lieu of specifying other Code-roquired examinations.

Item 2H Verify that there are not additional relief requests, other than those submitted April 14, 1987 (IR-1 through IR-5).

If additional relief requests are required, the Licensee should submit them for staff review.

Response

At this time, no additional relief requests are required.

Existing relief requests are based on experience of the Preservice Inspection.

ATTACHMENT A PIPING AND INSTRUMENTATION DIAGRAMS AS-D20569 MS-D20580 MS-D20581 CBS-D20233 MS-D20582 MS-D20583 CC-D20205 MS-D20587 CC-D20206 CC-D20207 NG-D20135 CC-D20209 NG-D20136 CC-D20211 CC-D20212 RC-D20841 CC-D20213 RC-D20842 RC-D20843 CGC-D20612 RC-D20844 RC-D20845 CO-D20426 RC-D20846 CS-D20722 RH-D20662 CS-D20723 RH-D20663 CS-D20724 CS-D20725 RMW-D20360 CS-D20726 CS-D20727 SA-D20652 CS-D20728 CS-D20729 SB-D20626 DG-D20458 SF D20482 DG-D20459 SF-D20484 DG-D20460 DG-D20461 SI-D20446 DG-D20463 SI-D20447 DG-D20464 SI-D20448 DG-D20465 SI-D20449 DG-D20466 SI-D20450 DM-D20349 SS-D20518 DM-D20352 SS-D20519 FP-D20271 SW.D20794 SW-D20795 FW-D20686 FW.D20688 VG-D20780 LD-D20864 WLD-D20218 WLD-D20219 MAH-D20504 VLD-D20221

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' Pigs 1 of 2 ATTACHMENT C SEABROOK STATION CALIBRATION BLOCKS DESCRIPTION.

NUMBER MATERIAL

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5' Reactor Vessel 196-101 SA-533 Gr. B 7'

Reactor Vessel 196-102 SA-533 Gr. B 9'

Reactor Vessel 196-103 SA-533 Gr. B 11' Reactor Vessel 196-104-SA-533 Gr. B Reactor Vessel Flange Ligament 196-201 SA-533 Gr. B Reactor Vessel Nozzle Safe End' 196.202 A-508 C1. 2 Mod.

s < '., s Reac;or Vessel Stud SB-RPV-STUD SA-540 Gr-B-24 Reactor Coolant Pump Bolt SB-RCP-BOLT SA-540 Gr-B-24 3'

Steam Generator 1-RC-MM-428A SA-533 Gr. A Cl. 2 s

4.5' Steam Generator 1-RC-MM-428B SA-533 Gr. A C1. 2 s

Steam Generator Primary Nozzle 1-RC-MM-430A SA-508 Cl. 2

<S Steam Generator Feedwater Inner SE-IR-47-CS SA-533 Radius

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Eddy Current Z-2551 t Inconnel 600 (Nom. Wall 0.042')

Eddy Current Z2491 Inconnel 600 p

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3' Pressurizer Shell & Nozzle 1-RC-MM-427B SA-533 Gr. A C1. 2 i

Pressurizer Spray Nozzles Irner SB-IR-23-CS SA-533 Radius i

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,i Pressurizer Safety Relief Nozzles SB-IR-27-CS SA-533 Inner Radius Pressurizer Surge Nozzle Inner SB-IR-32-CS SA-533 Radius CBS Hert Exchanger SB-1-CBS-HX SA-240 T-304 RHR Heat Exchanger SB-1-RHR-HX SA-240 T-304 t

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Page 2 of 2

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ATTACEMENT C PIPE / CLASS 1-2 NUMBER MATERIAL' DESCRIPTION SB-4-160-SS SA-376 to 316 4' Sch. 160 SB-6-160-SS-SA-376 to 316

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3 SB-16-100-CS SA-106 Gr.B 16' Sch. 100

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SB-18-100-CS SA-106 Gr.B 18' Sch. 100 SB-30-XX1-CS SA-155 Gr.KCF70 30' (1.110' Wall)

SB-30-XX2-CS SA-106 Gr.C 30' (1.637' Wall) j SB-32-XX1-CS SA-155 Gr.KCF70 32' (1.500' Wall)

SB-32-XX2-C6 SA-155 Gr.KCF70 32' (1.500' Wall)

SB-14-160-SS SA-376 T304 14" Sch. 160 SB-RC-3 SA-182 F304 31' ID (2.6' Wall)

SB-RC-4 GA-376 TP 304N 29' ID (2.33' Wall)

SB-RC-5 SA-351 Gr.CF8A 31" ID (3.0" Wall)

SB-18-XX1-CS SA-105 Norm.

18' (1.15' Wall)

SB-30-XX3-CS SA-105 Norm.

30' (1.15' Khll)

SB-6A-160-SS SA-376 to E316 6" Sch. 160 SB-3-40-SS SA-312 to 304 3" Sch. 40 SB-3-80-SS SA-312 to 304 3' Sch. 80 SB-3-160-SS-SA-376 to 316 3' Sch. 160 SB-4-40-SS SA-312 to 304

-4" Sch. 40 SB-4-80-SS SA-312 to 304 4' Sch. 80 SB-6-40-SS SA-312 to 304 6' Sch. 40 SB-8-40-SS SA-312 to 304 8' Sch. 40 SB-10-40-SS SA-312 to 304 10' Sch. 40 SA-312 to 304 12' Sch. 40 SB-12-40-SS f

SB-14-40-SS SA-358 to 304 14' Sch. 40 SB-16-STD-SS SA-240 to 304 16' Std. Wall

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ATTACHMENT D wN'A"ow9IO?rin"*EN?ce l

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NOT to Scale I

Skew Line Shell Side g g..

Skew Line Length Per Layout Barrel Side i

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O.D. Radius '

Limited Test End of Radius l

Out to 7 i " From End of Radius, Due to Unsmooth Surface l

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.g ATTACHMENT E TYPICAL MAIN STEAM 6" BRANCH SWEEP-O-LET f\\

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SWEEP-O-LET PIPE

'., l 68 not to scale

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