ML20080K241

Proposed Tech Specs Re Snubber Surveillance Requirements

ML20080K241
Person / Time
Site:	Millstone
Issue date:	01/31/1984
From:	NORTHEAST NUCLEAR ENERGY CO.
To:
Shared Package
ML20080K233	List: A03502, Application for Amend to License DPR-65,revising Tech Specs Re Inservice Insp of Hydraulic & Mechanical Snubbers ML20080K241
References
TAC-08952, TAC-8952, NUDOCS 8402150343
Download: ML20080K241 (24)

Text

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Docket No. 50-336 Attachment Millstone Nuclear Power Station, Unit No. 2

Proposed Revisions to Technical Specifications

Snubber Surveillance

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4 January,1984

! 8402150343 840118

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l PDR ADOCK 05000336

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' The attached proposed technical specification revisions are provided in response to Reference (1). The changes incorporate provisions contained in previous technical specification change requests (References (2) and (3)) as well as the model technical specifications provided to Northeast Nuclear Energy Company (NNECO's)in Reference (1).

A meeting with representatives from the Office of Inspection and Enforcement, Region I, was held on June 23,1983 to discuss differences between the NNECO's Reference (3) proposed technical specifications and the NRC model technical specifications. At that meeting, resolution was reached on the majority of the deviations identified during the Staff's review of the Reference (3) proposal. The attached proposed technical specifications include revisions to the Reference (3) proposal which incorporate certain provisions of the Reference (1) model technical specifications as well as provisions contained in recently issued technical specifications for new operating licenses.

The following discussion is provided to support the attached proposed technical s,necifications where deviations from the model technical specifications of Reference (1) exist.

1. Visual Inspections Acceptance Criteria: The model technical specifications require a verification that freedom of movement exists in those locations where snubber movement can be manually induced without disconnecting the snubber.

NNECO has not proposed this provision as part of the Millstone Unit No. 2 visual inspection acceptance criteria. During the snubber inspections conducted in fulfillment of the requirements of I&E Bulletin 81-01, NNECO utilized such in-place freedom of movement testing to establish mechanical snubber operability. Subsequent stroke testing of the snubbers did not confirm the conclusions reached through the manual in-place testing. As such, NNECO does not consider this provision in the model technical specifications to manually induce snubber movement in-place to be indicative and representative of snubber operability.

Furthermore, the amount of movement which can be induced in a snubber when it is attached to its supports is insignificant, rendering such a test inconclusive.

Open fluid ports have not been specifically identified in the technical specifications as a cause of snubber inoperability. The surveillance procedure for hydraulic snubbers, SP 2733A, identifies an open fluid port as a cause for declaring a snubber inoperable. NNECO does not consider the inclusion of detailed surveillance criteria within the technical specifications appropriate. The surveillance procedures more appropriately list the criteria by which a snubt: r is determined operable.

2. Mechanical Snubber Functional Test Acceptance Criteria: The applicable portions of the model technical specifications regarding mechanical snubber functional test acceptance criteria have been incorporated into the attached proposal. The provision ;u verify snubber release rate and displacement under continuous load has not been iac!uded. NNECO does not utilize mechanical snubbers at 'Ullstone Unit No. 2 designed to funcnon in a manner in which such testing would be applicable. As such, the inclusion of the model technical specification 4.7.9.e.3 is inappropriate.

As noted in the attached proposed technical spccification 4.7.8.1.e for Mechanical Snubber Functional Test Acceptance Criteria, NNECO has proposed to defer the effective date of this requirement until such time as test equipment is procured and installed onsite. NNECO is currently reviewing various testing machines on the market. It is expected that the equipment will be inservice by the end of 1984. In any event, the provisions of Specification 4.7.8.1.e proposed herein will become effective no later than June 30, 1985. This date was considered acceptable by the NRC Staff at the June 23,1983 meeting. In the interim, mechanical stroke testing (as described in Reference (3)) will be utilized to fulfill the requirements of Specification A.7.8.1.e.

3. Steam Gerierator Hydraulic Snubbers: The steam generator hydraulic snubbers are proposed to be exempted from the requirements for snubber functional testing in Specification 4.7.8.c. These snubbers are 50,000 lb or greater capacity and are tested and refurbished in accordance with a preventative maintenance program based on the manufacturers recommendations.

Each refueling outage, all 16 steam generator hydraulic snubbers are visually inspected. This inspection is designed to identify any evidence of leakage, structural defects, hardware anomalies and fluid reservoir level.

Approxiniately every five years, all 16 steam generator hydraulic snubbers are removed and sent offsite for functional testing and refurbishment.

This periodicity in testing and refurbishment is consistent with the manufacturers recommendations contained in ITT-Grinnell Instruction Manual No. THD-6511-8. It is NNECO's position that this testing frequency fulfills the intent of the model technical specifications and supports the requested exemption.

4. Tables 3.7-la and 3.7-lb, Applicable Modes: The MODES in which a snubber is required to be OPERABLE are consistent with the APPLICABILITY requirements for the system to which the snubber is attached as provided for in the technical specifications.

References:

(1) D, G. Eisenhut letter to All Power Reactor Licensees (Except SEP Licensees), dated November 20,1980.

(2) W. G. Counsil letter to R. Reid, dated January 8,1979.

(3) W. G. Counsil letter to R. A. Clark, dated July 15,1981.

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e IPLANT SYSTEMS 3/4.7.8 SNUBBERS LIMITING CONDITION FOR OPERATION 3.7.8.1 All snubbers listed in Tables 3.7-la and 3.7-lb shall be OPERABLE.

APPLICABILITY As shown in Tables 3.7-la_and 3.7-lb.

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ACTION As shown in Tables 3.7-la and 3.7-lb.

l SURVEILLANCE REQUIREMENTS 4.7.8.1 Each snubber shall be demonstrated OPERABLE by performance of the following augmented inservice inspection program and the requirements of Specification 4.0.5.

a. Visual inspection (r

- s Visual inspections shall be performed in accordance with the inspection schedule listed in Table 4.7-3.

b. VisualInspection Acceptance Criteria Visual inspections shall verify: (1) that there are no visible indications of damage or impaired OPERABILITY and (2) attachments to the foundation or supporting structure are secure. Snubbers which appear inoperable as a result of visual inspections may be determined OPERABLE for the purpose of establishing the next visual inspection interval, provided that: (1) the cause of the rejection is clearly ' established and remedied for that particular snubber and for other snubbers irrespective of type that may be 1.,.

MILLSTONE UNIT NO. 2 3/4 7-21

4 PLANT SYSTEMS 3/4.7.8 SNUBBERS generically susceptible; and (2) the affected snubber is f unctionally tested in the as found condition and determined OPERABLE per Specifications 4.7.8.d or 4.7.8.e, as applicable.

All snubbers connected to an inoperable common hydraulic fluid reservoir shall be counted as inoperable snubbers.

c. Snubber Tests At least once per eighteen (18) months during shutdown, a representative sample (10% of the total of each type of snubber, mechanical and hydraulic, except steam generator hydraulic snubbers in use in the plant) shall be tested either in place or in a bench test. For each snubber that does not meet the test acceptance criteria of Specification 4.7.8.ld or 4.7.8.le, as applicable, an additional 10% of that type of snubber shall be tested.

Testing shall continue until no additional inoperable snubbers are found within a sample or until all snubbers in Tables 3.7-la and 3.7-lb have been tested. The representative sample selected for testing shall include the various configurations, and the range of size and c:ipacity of snubbers.

Snubbers identified in Tables 3.7-la and 3,7-lb as "Especially Dif ficult to Remove" or in "High Radiation Zones During Shutdown" shall also be included in the representative sample.* Tables 3.7-la and 3.7-lb may be used jointly or separately as the basis for the sampling plan.

In addition to the regular sample. in locations where snubbers had f ailed the previous test due to operational or environmental conditions (excessive vibration, water hammer, high radiation, extreme heat or bumidity, etc.),

the snobbers currently installed in these locations shall be tested during the next test period. Test results of these snubbers may not be included for the resampling. All replacement snubbers shall have been tested prior to installation.

All steam generator hydraulic snubbers shall be tested and ref urbished in accordance with the preventative maintenanca program, based on the manuf acturers recommendations, and are exempted f rom the requirements of this specification.

• Permanent or other exemptions f rom functional testing for individual snubbers in these categories may be granted by the Commission only if a justifiable batis for exemption is presented.

MILLSTONE UNIT NO. 2 3/4 7-22

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PLANT SYSTEMS 3/4.7.8 SNUBBERS If any snubber selected for testing either fails to lock-up or fails to move

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(i.e., frozen in place), the cause will be evaluated and if caused by manufacturer design deficiency, all snubbers of the same design subject to the same defect shall be tested regardless of location or difficulty of removal. This testing requirement shall be independent of the

' requirements stated above for snubbers not meeting the test acceptance criteria.

For the snubber (s) found inoperable, an engineering evaluation shall be performed on the components which are supported by the snubber (s). The purpose of this engineering evaluation shall be to determine if the components supported by the snubber (s) were adversely affected by the inoperability of the snubber (s) in order to ensure that the supprted component remains capable of meeting the designed service.

d. Hydraulic Snubbers Functional Test Acceptance Criteria The hydraulic snubber functional test shall verify that:

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1. Activation (restraining action) is achieved within the specified range of velocity or acceleration in both tension and compression.

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2. Snubber bleed, or release rate, where required, is within the specified range in compression or tension.

e. Mechanical Snubbers Functional Test Acceptance Criteria

• The mechanical snubber imetional test shall verify that:

1. The force that laitiates free movement ci the snubber rod in either tension or compression is less than the specified maximum drag force.

2. Activation (restraining action) is schieved within the specified range of velocity or acceleration in both tension and compression.

• Mechanical snubber functional test acceptance criteria shall become effective upon installation of snuisber testing equipment but not later than June 30,1985.

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MILLSTONE UNIT NO. 2 3/4 7-23 T

PLANT SYSTEMS 3/4.7.8 SNUBBERS

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f. Snubber Service Life Monitoring A record of the service life of each snubber, the date at which the designated service life commences and the installation and maintenance records on which the designated service life is based shall be maintained as required by Specification 6.10.2.h. ,

Concurrent with the first inservice visual inspection and at least once per 15 months thereafter, the installation and maintenance records for each snubber listed in Tables 3.7-ia and 3.7-lb shall be reviewed to verify that the indicated service life has not been exceeded or will not be exceeded prior to the next scheduled snubber service life review. If the indicated service life will be exceeded prior to the next scheduled service life review, the snubber service life shall be reevaluated or the snubber shall be replaced or reconditioned so as to extend its service life beyond the date of the next scheduled service life review. This reevaluation, replacement or reconditioning shall be indicated in the records.

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'l TABLE 3.7-le (Continued) -

SAFETY RELATED HYDRAULIC SNUBBERS

• HANGER. SYSTEM, LOCATION ACCESSIBLE OR - HIGH RADIATION No. (1) AND ELEVATION ' ESPECIALLY DIFFICULT APPLICABLE INACCESSIBLE ZONE ** TO REMOVE MODES (3) ACTION (A or !) (Yes or No) l 501022 (2) HPSI-F.8/18.9/-29 A Yes Yes 1, 2, 3, 4 1 302032 CS-E.5/19.6/+2 A Yes i

No 1, 2, b) 1 24002 HPSI-F.2/18.5/-42 A Yes No 1, 2, 3, 4 1 504003 HPSI-F.2/17.2/-42 A Yes

No 1, 2, 3, 4 1 505166 (2) RBCCW-J.7/17.2/-16 A No No 1, 2, 3, 4 1 I %7004 HPSI-F.2/18.5/-42 A Yes No 1, 2, 3, 4 1 1 510017 SIT-6N/47E/+15 I No No 1, 2, b) i

310018 SIT-6N/47E/+15 I No No 1, 2, b) 1

.I j 513023 (2) MS-K.6/19.6/-2 A Yes 1

No 1, 2, 3 1 i

513032 MS-E/19/+48 A Na No I, 2, 3 (2) 2 S51-558 (8) SG #1 I Yes Yes 1, 2, 3 1

't S51-558 (8) SG #2 I Yes Yes 1, 2, 3 1 Table Notation Snubbers may be added or deleted withnut prior License Aenendment to Table 3.7-It. provided that a revision to Table 3.7-la is included with the next License Amendment request. In lieu of any other report required by Specification 6.9.1, at least 15 days l prior to the deletion of any listed snubber, a Special Report shall be prepared and submitted to the Corrmission in accordance

! with Specification 6.9.2 evaluating the safety significance of the proposed snubber removal.

1 i **

Modifications to this column due to changes in high radiation areas may be made without prior License Amendment provided that a revision to Table 3.7 ~ia is included with ue next License Amendment reqet.

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INACCESSIBLE ZONE ** YO REDEWE Im0L3 (3) ACTION

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l 60245 RHV- 18N/26E/59 I Yea No 1,2,3,4 1

{ 60246 RHV- 21N/26E/57 I Yes . No 1,2,3,4 1 60247 RHV- 18N/27E/59 I Yes No 1,2,3,4 1

M 60251 p RHV-18s/2E/32 I Yes No 1,2,3,4 1 60253 - RHV-18s/1w/30 I Yes No 1,2,3,4 1 i 302092 HPSI-F.2/18 9/-42 A Yes No 1,2,3,4 i - 1 t

310022 SI-46S/22E/-3 I No , No 1,2,3,4 1 401014 LPSI-E.5/16.8/-35 A Yes No 1,2,3(+),6 4

! ,. 401016(2) LPSI-E.5/16.8/-36 A Yes No 1,2,3(+),6 4 .

! 401018 HPSI-F.3/16.6/-34 A Yes sto 1,2,3,4 1

401019(2) HPSI-F.3/16.6/-30 A Yes No 1,2,3,4 1 4

401020(2) HPSI-F.3/16.6/-28 A Yes No 1,2,3,4

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_5AFFTY RELATED MECHANICAL SNUBBEllS*

i HANCER SYSTEM LOCATION j ACCESSIBLE OR HICH RADIATION g- NO. (1) AND ELEVATION INACCESStr.tE ESPECIALLY DIFFICULT AFFLICABLE ZONE ** TO REM 0"C (A or I) (Yes or No) (Yes or No)

_MDDE.7_(3) ACTION g 402008 , , SDC-F.2/18.9/-32 A Yes J No 6-i n 402120, 3 SDC-F.2/18.9/-35 A Yes No 4...,

6 3 404020(2) HPSY-E.5/18.4/-8 A Yes No' 1,2,3,4 1 405647 RBCCW-M.4/16.6/9 A- No No 1,2,3'4 , 1 408001 RCS-17N/27E/54 I No , No 1,2,3,4 - 1 408002(2) RCS-15N/29E/60 I No No l

1,2,3,4 1 i . g, 408003(2) RCS-20N/29E/56 I

^ No No i < 1,2,3,4 1 408004(2) RCS-20N/29E/55 I No No Y 1,2,3,4 1 408009(3) RCS-23N/30E/46 I

! No No 1,2,3,4 1 408010(4) RCS-21N/20E/56 J. No No 1,2,3,4 I 1 i

6

! 410007

. - SI-55S/50E/-10 I Yes

~

No 1,2,3(+) 1 410037(2) RCS-17N/38E/53 I No No 1,2,3,4 1 f 410040 RCS-17N/39E/52 I No No 1,2,3,4 410046 1 RCS-8N/19E/28 I Yes No 1,2,3,4 1

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,7 7 *3.7-Ib f

e SAFETY RELATED MECHANICAL 3NUBBERS* ' '

I U HAIACER SYSTEM. LOCATION j ACCESSIBLE OR HICH RADIATION 1

h NO. (1) AND ELEVATION INACCESSIBLE ZONE **

ESPECIA2.LY DIFFICULT To REMOVE APPLICABLE (A or I)

MODES (3) ACTION  !

(Yes or No) (Yes oc No)

U 410049 RCS-8N/18E/15

, I Yes No 1,2,3,4 1 2 410054 RCS-6N/li3E/26 I Yes No 1,2,3,4 1 410059 RCS-24S/18E/22 I Yes No 1,2,3,31 1 410062(2) SDC-18S/48W/-6 I I No- Mo 6 3 l 410092 SI-53S/33E/-6 I to No i 1,2,3(+) 1 b

,  ! w i

4

! X' 411045(2) nt-E.0/22. 0/44 A

.. No No 1,2,3(2) 2 411062(2) FW-D.0/20.0/38 A No No 1,2,3(2) 2 413064(2) MS-L.6/19.8/52 A No No 1,2,3 1 413132(2) MS-L.6/18.9/52 A No No 1,2,3 1 -

413135(2) MS-E.5/19.0/43 A No No 1,2,3 1 414001(2) RCS-22N/202/55 I No No 1,2,3,4 1 414002(2) RCS-20N/20E/55 I No. No 1,2,3,4 1

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' SA*ETT RFLATED MECMANICAL SNUBBERSe O HANCER SYSTEM, LOCATION ACCESSIBLE OR HICH RAD 1ATION

% Ho. (1) AND ELEVAT10l4 ~ INACCESSIBLE ZONE *'

ESPECIALLT DIFFICtJLT AFFLICABLE To REMOVE (A or I) (Yes or No) (Yes or No)

MDDES {3) ACTION l 414006(2),,,'RCS-24N/20E/45 I No No w 1,2,3,4 1 414009(2) RCS-24N/30E/40 I No No 1.2 3,4 1

[ 414016(2) RCS-21N/31E/44 i i No No 1,2,3,4 1 j 414018(2) RCS-15N/30E/58 I No No l 1,2,3,4 1 414021(2) RCS-15N/31E/54 I No .No 1,2,3,4 1 41Lv.14(2) RCS-20N/31E/53 I

! No No 1.2.3,4 1 R 414025(2) RCS-20N/31E/58 I No No 1,2,3,4 i 1 w 414027(2) RCS-21N/30E/58 I No No 1,2,3,4 1 h 414029(4) RCS-20N/33E/51 I No Na 1,2,3,4 1 4th032(2) RCS-22N/33E/55 I No No

! 414033(2) 1,2,3,4 1 J .. 3CS-23N/32E/55 I No. .

, No 1,2,3,4 414035 1 RCS-25N/39E/29 I Yes No 1,2,3,4 1 416016(2) CS-3S/63E/24 I No No

',. 1,2,3(+) 1 416021 CS-43S/43W/7 I No llo 1,2,3(+) 1 416022 CS-43S/43W/5 I No No 1,2,3(+) 1 416032(2) CS-3N/62W/108 I No No 1,2,3(+) 1 427110 SW-L.5/15.9/5 A No N) 1,2,3,4 1

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! U HANCER SYSTEM, LOCATION

ACCESSIBLE OR MICH RADIATION h NO. (1) AND ELEVAT10h _ INACCESSIBLE ZONE **

ESPECIALLY DIFFICULT To REMDVE APPLICABLE *

(A or I) MDDES (3) ACTION <

(Yes or No) (Yes or No) l427111 .. ,. SW-L.5/15 9/5 A No No 1,2,3,4 1

• 427115(2) sW-L.5/15 9/-14 A No No 1 3 2,3,4 1 3 450058(2) RBCCW-F.8/17.2/-34 A Yes No 1,2,3,4 1 j 501023(2) Cs-E.5/18 5/-41 A Yes No 1,2,3,4 1

, 50102k cs-E.5/18 5/-38 A i Yes No 1,2,3,4 1

, j 502024(2) sDC-F.2/19.6/-9 A

~ ' Yes No 6 I t 502026 3

1

• LPsI-F.2/19.6/-15 A Yes No i

1,2,3(+),6 4

, y 502035 LPsI-E.5/18 5/-37 A i i i Yes No 1,2,3(+),6 4

!# 505143 RBCCW-H.4/16.6/-13 A-i > . No No

1,2,3,4 1 507002 sI-34s/44s/1/ I No No 1,2,3(+) i

! ,, 510004 s1-57s/21E/-10 ,I No No 1,2,3,4 1 512001- Ms-E.5/20.0/43 A No

!l 512002 ms-M.4/18.9/60 A No No No 1,2,3 1,2,3 1

1

). 512003- Ms-E.5/20.0/40 A No No 1,2,3 1 i 513008- us-L.5/18 9/44 A No No 1,2,3 513036 Ms.L7/18.9/45 A No 2/

No 513040 ms-L,5/ts,9/47 A No No 1,2,3

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! SAFETT RELATED MECHANICAL SNUBBERS 4 ' '

' c; MANCER s -

SYSTEM. IACATION ACCESSIBLE OR (1) HICH RADIATION ESPECIALLY DIFFICULT l

h _NO. AND ELEVATION INACCESSIBLE ZONE **

APPLICABLE l , To_tEMOVE MDDES (3)

(A or 1) (Yes or No) (Yes or No)

_ ACTION f E 513041

<., MS-K.6/19.6/-2 A Yes No 1,2,3 2 N 513042 MS-K.6/18.9/9 A Yes No 1,2,3 2

, 514001 RCS-18N/32E/29 I No No 1,2,3,4

• 1 527071(2) SW-L.5/16.6/-11 A No No 1,2,3,4 1 i 527072(2) SW-L.5/16.6/-11 A No No 1,2,3,4 1

! FSKM02022 I MS-4S/39E/10 I No No I w D.P. 107' -

1,2,3 2

! 1 FSKM02022

' MS-3N/39E/10 I No No l u D.P. 109 1,2,3 2

! O FSKM02023 MS-25S/41E/18 I No 1,2,3

$ D.P. 158 No 2

} FSKM02024 MS-43S/30E/-10 I Yes No D.P. 23 1,2,3 2 i l FSKM02025 MS-31S/32W/-9 I Yes No

D.P. 125(2) 1,2,3 2

FSKMC2026 MS-29S/35W/23 I Yes No i

D.P. 307~ 1,2,3 2 I' FSKM02027 MS-17S/32W/24 t

D.P. 190' I Yes No 1,2,3 2

PSM02030 MS-6M/33W/-5 I No D.P. 253 No 1,2,3 2 -

l .

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TABLE 3 7-lb

• SAFETY RELATED MECHANICAL SNUBBERS * ,

HANGER SYSTEM, LOCATION ACCESSIBLE OR HIGH RADIATION ~

No. (1) AND ELEVATION ESPECIALLY DIFFICULT APPLICABLE INACCESSIBt E ZONE ** TO REMOVE ,_MCDES (3)

(A or 1)

ACTION (Yes or No)

FSKM02097 MS-25/40E/10 I No No 1, 2, 3 D.P. 402 2 FSKM15021 HPSI-E.5/19.9/-3 A No No 1,2,'3,4 D.P.781 1 FSKMI5029 HPSI-F.2/19.6/-3 A No No 1, 2, 3, 4

, D.P. 537 1 FSKM17013 CVCS-F.2/19.6/-12 A Yes No 1, 2, 3, 4 D.P.38 1 FSKM17095 CVCS-22S/19W/3 I Yes No 1, 2, 3, 4 D.P. 34 1 t

FSKM17095 CVCS-22S/19W/6 I Yes No 1, 2, 3, 4 1 D.P. 50-1 FSKM17103 CVCS-205/25W/-il I Yes No 1, 2, 3, 4

, D. P. 411 1 FSKM32012 CVCS-15S/18W/-6 I Yes Ne 1, 2, 3, 4 D.P.152 1 SK-M-1016 MS-K.6/19.6/-2 A Yes No 1, 2, 3 2 D.P.208 SK-M-1016 MS-K.6/19.6/-2 A Yes No 1, 2, 3 2 i D.P. 215 j Table Notation Snubbers may be added or deleted without prior License Amendment to Table 3.7-Ib provided that a revision to Table 3.7-lb is  ;

included with the next License Amendment request. In lieu of any other report required by Specification 6.9.1, at least 15 days prior to the deletion of any listed snubber, a Special Report shall be prepared and submitted to the Commission in accordance

., with Specification 6.9.2 evaluating the safety significance af the proposed snubber removal.

Modifications to this column due to changes in high radiation areas may be made without prior License Amendment provided that ar '*ision to Table 3.7-1b is included with the next License Amendment request.

a - _____ - _

=

Tables 17-la rnd 3.7-lb (Crntinued) -

SAFETY RELATED SNUBBERS Table Notation (1)

The hanger number is listed. Where more than one snubber is associated with a given hanger, it is se indicated in parentheses.

(2) Snubber operability is not required if the line containing the hanger is isolated from the SG.

(3) li the associated facility is inoperable, snubber operability is not required.

(4) Whenever irradiated fuel assemb?ies are in the storage pool.

'(+) With pressurizer pressureh1750 psia.

ACTION Statements *h ACTION 1 - Restore the inoperable snubbers (s) to OPERABLE status within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> or be in at least HOT STANDBY within the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and in a MODE not requiring the snubbers to be OPERABLE within the following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />.

ACTION 2 - Restore the inoperable snubber (s) to OPERABLE status or isolate the line containing the hanger from the affected steam generator within 72 hotrs or be in at least HOT STANDBY within the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and in a MODE not retuiring the snubbers to be OPERABLE within the following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />.

ACTION 3 - Restore the inoperable snubber (s) to OPERABLE status within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> or suspend all operations involving a reduction in boron concentration of the Reactor Coalant System.

ACTION 4 - Complete ACTION Statement 1 if in MODES 1,2 or 3(+) and ACTION Statement 3 if in MODE 6. l ACTION 5 -Restore the inoperable snubber (s) to OPERABLE status within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> or verify the temporary connection from the l shutdown cooling heat exchangers is isolated. The provisions of Specification 3.03 are not applicable.

l ACTION 6 - Restore the inocerabu snubber (s) to OPERABLE status within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> or connect shutdown cooling to the spent fuel '

pool cooling system. The provisions of Specification 3.03 are not applicsble.

An engineering evaluation of systems or components supported by inoperable snubber (s) shall be performed per Specification 4.7.8.1.c within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> for each ACTION.

1. An engineermg evaluation may be performed for the purposea of declaring the affected system operable with the inoperable snubber, provided a prompt report is submitted pursuant to Specification 6.9.1.8.i and the snubber is repaired at the next outage of suf ficient duration.

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TABLE 4.7-3 '.. .,

SNUBBER VISUAL INSPECTION SCHEDULE NUMBER OF SNUBBERS FOUND INOPERABLE DURING INSPECTION INTERVAL

• SUBSEQUENT VISUAL INSPECTION INTERVAL **l 0

1 18 months i 25%

i

! 2 12 months i 25%

3 or 4 6 months i 25%

5, 6 or 7 124 days i 25%

>8 62 days i 25%

31 days i 25%

w

• Snubbers may be categorized into two groups: Mechanical and Hydraulic.

may be divided into two subgroups: Each group 2 reactor operation.

accordance with the above schedule.

Each group and subgroup may be inspected independently inthose ac

.J

• *The required inspection interval shall not be lengthened more tha:2 one step at a time.

1. The provisions of Specification 4.0.2 are not applicable.

d h

O

l l PLANT SYSTEMS 3/4.7.8 SNUBBERS BASES 3.4.7.8 SNUBBERS All snubbers are required OPERABLE to ensure that the structural integrity of the reactor coolant system and all other safety related systems is maintained during and following a seismic or other event initiating dynamic loads. Snubbers excluded from this inspection program are those installed on nonsafety-related systems and then only if their failure or failure of the system on which they are installed, would have no adverse effect on any safety related system.

The visual hapection frequency is based upon maintaining a constant level of snubber protection to systems. Therefore, the required inspectior. interval varies inversely with the observed snubber failures and is determined by the number of inoperable snubbers found during an inspection. Inspections performed before Qat interval has elapsed may be used as a new reference point to determine the next inspection. However, the results of such early inspections performed before the original required time interval has elapsed (nominal time less 25%) may not be used to lengthen the required inspection interval. Any inspection whose results require a shorter inspection interval will override the previous schedule.

When the cause of the rejection of a snubber is clearly established and remedied for that snubber and for any other snubbers that may be generically susceptible, that snubber may be exempted from being counted as inoperable. Generically susceptible snubbers are those which are of a specific make or model and have the same design features directly related to rejection of the snubber by visual inspection, or are similarly located or exposed to the same environmental conditions such as temperature, radiation, and vibration. Due to the size and location of the steam generator hydraulic snubbers, regular removal and testing as specified for hydraulic and mechanical snubbers would represent a significant under taking during each refueling outage. As such, these snubbers have been treated separately and are tested and refurbished as a group in accordance with the manufacturer's recommended preventative maintenance pogram.

When a snubber is found inoperable, an engineering evaluation is performed, in addition to the determination of the snubber mode of failure, in order to determine if any safety related component or system has been adversely affected by the inoperability of the snubber.

MILLSTONE UNIT NO. 2 B 3/4 7-5 r

c . .

, e .

PLANT SYSTEMS 3/4.7.8 SNUBBERS The engineering evaluation shall determine whether or not the snubber mode of failure has imparted a significant effect or degradation on the supported component or system.

To provide assurance of snubber reliability, a representative sample of the installed snubbers will be te.sted during plant shutdowns at eighteen (18) month intervals. Observed failures of these sample snubbers shall require testing of additional units.

Hydraulic snubbers and mechanical snubbers may each be treated as a different entity for the above surveillance programs.

The service life of a snubber is evaluated via manufacturer input and information through consideration of the snubber service conditions and associated installation and maintenance records (newly installed snubber, seal replaced, spring replaced, in high radiation area, in high temperature area, etc. . .). The requirement to monitor the snubber service life is included to ensure that the snubbers periodically undergo a performance evaluation in view of their age and operating conditions. These records will provide statistical bases for future (f;.-

consideration of snubber service life. The requirements for the maintenance of records and the snubber service life review are not intended to affect plant operation.

i l

f 1

1 1

MILLSTONE UNIT NO. 2 B 3/4 7-6 9

, . _ _ . - - ,