ML20094N249

Staff Exhibit S-28,consisting of Justification for Continued Operation Developed to Assist in Evaluation of Splices Utilized in Certain Environmentally Qualified Limitorque MOV Motor Power Leads

ML20094N249
Person / Time
Site:	Farley
Issue date:	02/13/1992
From:	Hairston W ALABAMA POWER CO.
To:
References
CIVP-S-028, CIVP-S-28, NUDOCS 9204060246
Download: ML20094N249 (32)

Text

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NC-BMYE1 cn m Evaluation f or Continued Operation.

Limitorque M]V Motor Power Lead Splices W W D R232 July 30, 1987 in Environmental Qualification Scope

o.,,

%.n W. G, Hairston, IllD n JJ SI Nt IM '

F rom Vice President.

UGW 1.9 W " V M u

Te Mr. J. D. Woodard Nuclear Generation Enclosures 1 and 2 compile a justification for continued operation (JCO) developed by Becntel to assist FNP in their evaluation of splices utilized in certain environmentally qualified (EQ) Limitorque NV motor power leads.

Tne Unit 1 evaluation to determine if terminal strips exist has been Tne Unit 2 evaluation for terminal strips has not been completed.

This JC0 assumes the Unit 2 valves that have not been inspecteo completed.

do not contain terminal strips.

No deficiencies are known regarding motor power cables terminated on terminal strips; therefore, they are not Also not included in the enclosed JC0 are H]V 3660, 3872A and includea.Tne JC0 also assumes no potential deficiencies exist on M3V 3660.

38728.

The evaluation methodology was based on-the location of the valve operators and the resulting severity of the design basis accident environmental for valve operators located inside the Containment (CTMT) or ennditions, Main Steam Valve Room (MSR), an operability analysis was performed by evaluating the normal plant operation position of each valve, and the For valve required accident mitigation and post accident positioning.

operators located outside the CTMT and MSR, the design basis accident environmental conditions are less severe with the primary concern being only raciation degradation due to post LOCA retirculated fluids, as valve operator temperatures are expected to be witnin normal operating design Valve operaturs outside the CTMT and M5R were evaluated by considerations.

The analyzing the environmental ef fects on the motor power lead splices.

splice material and configuration assumed in this evaluation is the worse case expected at FNP.

As a result of this evaluation it has been determined tnat the reg'Jired safety functions within the scope of this evaluation can be expected to be performed by the valves considered or by alternate means during a design basis event.

The Tne Bechtel evaluation has divided the subject valves into four groups.

valves in Group 2 are located in the main steam valve room or containment and do not require post accident operation. Seven of the Group 2 valves are included in Emergency Response Procedures and could be repositioned This evaluation assumes these valves do not reposition during tne accident.

because an alternate means of performing these f unctions exists as described bel ow.

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Mr. J. D. Woodard Page 2 The post accident venting system consists of the instrument air supply to containment (MOV 3536) and the post accident vent from containment (MOV 3530). FSAR Section 6.2.5 identifies operation of the post accident venting system for combustible gas control in containment. MOV 3536 and MOV 3530 may be assumed to remain in the closed position with no long tem post accident operation requirement.

Tnis is justified since the post accident venting system is a backup to the redundant post LOCA hydrogen recombiners.

7 The recombiner system incorporates several design features intended to assure the capability of the system to be operable in

. design,'(2) protection from missile and jet impingement and (3)y 1 the event of an. accident. Among these are: (1) seismic categor g

redundancy to the. extent that no single component f ailure disables both recombiners.

As stated in NUREG-0117 Supplement 4 (Farley Nuclear Plant SER).-

" redundant... recombiners in the containment are the primary means of post-accident combustible gas-control, in addition the post-accident venting system is provided as a backup system for the. redundant hydrogen recombiners."

Tne Emergency Response Procedures (ERPs) instruct the operator to verify ootn post LOCA nydrogen recombiners are in service if containment hydrogen concentration is less than 4%.

FSAR Table 15.4-11 snows the total nydrogen accumulated in containment for the maximum credible accident will not reach 41 for 100 days.

Since the post accident venting system is a backup system and the ERPs instruct the operator to place the post accident LOCA hydroger, recomDiners in service, opening MOV 3536 and MJV 3530 is not required.

The post LOCA hydrogen analyzer sample flow path isolation-valves (MOV 3528A, B and C,- and MOV 3835 A and B) are normally locked -in the closed position. Subsequent long term operations for the purpose of placing the hydrogen analyzers in service is addressed in the emergency response procedures. However, these long. tem operations are not essential.to' mitigate esign bases events.

Manual post accident containment. atmosphere sampling capability is provided via a system which is not dependent on the post LOCA hydrogen analyzer flow path. Emergency response procedures provide for obtaining and analyzing grab samples if the post LOCA hydrogen analyzers are not 'f unctional.

Mr. J. D. Wooda rd Page 2 Group 3 valves in Unit 1 include MJV 3046. Tnis valve receives a Pnase 6 actuation signal. The post accident operation of this valve has been evaluated to be snort term only in the case of design basis events. This is consistent with the post accident profiles submitted to the NRC.

A copy of this evaluation should be placed in the Environmental Qualification Central File under Limitorque MOVs.

A W. G. Hairston, 111 WGH,111/BDM: dst-060 Enclosure cc:

Mr. W. B. Sn'ip'an m

Mr. J. L. Garlington Mr. D. H.-Jones tir. K. C. Gandni File: A-5001 lEB 79-013

ENCLOSURE 1 Bechtel Eastern Power Corporation ensn..r. -- constructors 15740 Shady Grov. Road Galthersburg, Maryland 20677 1454 301 - 258-3000 g g g ggy a

In reply refer to AP-13217 Fr. W. G. Nairston, III Alabama Power Company 600 North 18th Street Post Office Box 2641 Birmingham, Alabama 35291-0400 Dear Mr. Hairston Joseph H. Tarley Nuclear Plant Units 1 and 2 Bechtel Job 7597-011 EQ Motor Operated Valve Splices - Justification for Continued operation (87-0-4441)

Bechtel Files.A-78, E-91 AP-13217 This letter supplements our letter AP-13202 dated July 29,

~

1987.

t Attachment I was forwarded by APCO on July 30, 1987.

Based on Attachment 1 we have expanded Tables 5, 6, 7 and 8.

These expanded tables are included as Attachment 2.

It is noted that all valves added to tables 5 thru 8 fall under Groups 1, 2. or 3 and justifications made in AP-13202 for these groups of valves are valid.

Please note for valves where the actual connection (terminal block or splice) has not been verified, we have assumed the connection to be a splice (indicated by a " Blank" in the table).

If you have any questions or comments, plearn contact us.

Yo s very truly, t

^

• • "a E.*C. Gandhi l

Project Engineer KCG/AJD/DGBJag Enclosures As stated above cc 5

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ENCLOSURE 2 Bechtel Eastern Power Corporation y,

Engineers - Constructors l

15740 Shady Grove Road

/

Gaithersburg. Maryland 20877 1454 301 - 256 3000 9J Ji 2 91967 In reply refer to AP-13202 Mr. W.

G.

Hairston, III Alabama Power Company 600 North 18th Street Post Office Box 2641 Birmingham, Alabama 35291-0400 Dcar Mr. Hairston Joseph M. Tarley Nuclear Plant Units 1 and 2 Bechtel Job 7597-011 EC Motor Operated Valve Splices - Justification for Continued Operation (87-0-4441)

Ecchtel Tiles E-91, A-78 AP-13202 In a telephone call on July 27, 1987 APCo (Mr.

J.

E.

Garingtons requested Lechtel provide Justification of continued operation for EC motor operated valves (those specifically listed in Appendix A to Attachment 1) that use i

a splice connection between the motor power leads and the field conductors.

The requested justification for continued operation it attached.

If you have any questions or comments, please contact us.

Yours very truly, 9 'h f

L.

. Gandhi l

Project Engineer l

l FCG/AJD/DGE: rah l

Enc 1' es l

As mated above cc J.

R.

Crane, w/1 J.

D.

Woodard, w/2 I-J.

E.

Garlingten, wil E.

G.

Berryhill, v.'2 i

l

\\.,,

i

• to AP-13202 Page 1 SUBJECTi Evaluation of splices used on motor power leads'for Safety Related Motor Operated Valves in the scope of the Environmertal Qualification Program.

1.0 INTRODUCTIOM The list of motor valves evaluated is contained in Appendix A..

.For this evaluation the motor operated valves have been divided into four groups.

These four groups ares a.

GROUP 1 Mot [.operatedvalvesthatarenot located inside the containment or the main steam valve room.

These valves are listed in Table 1 (Unit 1) and Table 5 (Unit 2).

b.

GROUP 2 Motor operated valves that are located inside the containment or the main steam valve room that do not require post event operation.

(No repositioning required).

These valves are listed in Table 2 (Unit 1) and Table 6 (Unit 2).

c.

GROUP 3 Motor operated valves located inside the containment or main steam valve room that require short term post event operation.

These valves are listed in Table 3 (Unit 1) and Table 7 (Unit 2).

d.

GROUP 4 Motor operated' valves located inside the containment or main stenm valve room that require long term post event operation.

These valves are listed in Table 4 (Unit 1) and Table B (Unit 2).

1.0

e At t a c hne nt I to AP-13202 Page 2 3

2.0 DESCRIPTION

OF THE SPLICE The splice evaluated is a bolted ring tongue forme.

a "V"-configuration enclosed by'T95 tape.

(See rigure 1).

This type splice is the worst case configuration suspected at FNP.

3.0 ANALYSIS 6..

GROUP 1 For this group of valves radiation is the only environmental parameter that needs to be considered in the evaluation.

Temperature, pressure, and humidity are all considered to be in the normal operating range.

T95 Tape has been qualffied to 200 MRADS (Okonite Test Report NQRN-3 Rev. 1).

Radiation levels in areas under consideration are less than 200 MRADS.

Based on the above there is every reason to believe that the motor operated valves would operate as required, b.

GROUP 2 Por this group of valves the motor starter power contacts are all normally open and there is no reason to change the state of these contacts (manua'i or automatic) during or after an event.

Since motor power contacts are open, there is no potential available to cause valve repositioning or malfunction, c.

GROUP 3 Valves in this group receive automatic actuation signals as a result of an even':(s).

On receipt of the automatic signal these valves stroke to their safety position and remain in that position.

These valves are not required to be repositioned during or after the event.

Cc,nsidering the above, power is applied to the motor and the splice under consideration for a very short period of time (approximately 30 seconds).

When the valve (s) reaches its safety position the valve scarter contacts are opened and remain open thus eliminating any voltage in the area of the splice.

Therefore, no potential exists to cause the valve to reposition or malfunction.

~

1

• to AP-13202 Page 3 Considering the moisture resistance of T95 tape and the motor operator enclosure, coupled with the short. length of time that power is required to t'he valve operator; it is reasonable to believe that these v>3ves will stroke to their required safety position on demand.

d.

GROUP 4 Repositioning of these *ralves is required at approximately 5 minutes or longer after an event.

Due to the length of time that these splices could be exposed to a harsh environment it is

-recommended that the actual configuration of'the splice be determined and evaluated for acceptability.

4.0 CONCLUSION

S.

GEO'UP 1 a.

Since the valves in this group are only subjected to post LOCA radiation and not subject to temperatures, pressures and humidity above the plant normal design conditions and T95 tape has been qualified to 200 MRADS, it is reasonable to believe that these valves will perform their intended safety function on demand, b.

GROUP 2 Valves in this group will not malfunction regardless of the condition of the motor pigtail splice since there is no potential in the area of the splice to cause the valve to reposition or malfunction.

c.

GROUP 3 It is reasonable to believe that the valves in this group will stroke to their required safety position basedDon the following:

o Moisture resistance of-the motor enclosure.

Moisture resistance of the T95 tape.

o

i l

Attachment I to AP-13202 j

Pagt 4 i

c Existing qualification data on T95 tape.

o

.The short period of time (Approx. 30 seconds).

That power is required to the valve to perform its safety function (and correspondingly the same period of f

time that eplice must perform without malfunction.)

o-Valve.does.not have to be repositioned j

after initial stroke to its safety position.

4 The valves in this group will not reposition or malfunction after reaching their safety related position since.there is no potential in the area of the splice.

d.

GROUP 4

)

If a field inspection shows that splices for this group of valves are not in accordance with an approved detail for E.Q. splices, the existing splice should be further evaluated or rema.de in accordance with an approved detail as soon as practicable, i

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