ML18114A737

Responds to IE Bulletin 79-01, Environ Qualification of Class IE Equipment. Suspected Solenoid Valves Will Be Upgraded or Replaced as Soon as Possible

ML18114A737
Person / Time
Site:	Surry
Issue date:	06/25/1979
From:	Stallings C VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	Moseley N NRC OFFICE OF INSPECTION & ENFORCEMENT (IE)
References
FOIA-81-97 090, 90, NUDOCS 7906270121
Download: ML18114A737 (25)

Text

.I.

e VIRGINIA ELECTRIC AND POWER COMPANY RICHMOND,VIHGINIA 23261 June 25, 1979 Norman C. Moseley, Director Division of Reactor Operations Inspection Office of Inspection and Enforcement U. S. Nuclear Regulatory Commission Washington, D. C.

20555 Serial No.

PO/DLB:baw Docket Nos:

License Nos:

090 50-280 50-281 DPR-32 DPR-37

Subject:

IE Bulletin 79-01 Surry Power Station Units Nos. 1 and 2

Dear Mr. Moseley:

This is in response to IE Bulletin 79-01; "Environmental Qualification of Class IE Equipment".

In response to IE Circular '78-08, a program was initiated to review the environmental qualification of safety related electrical equipment in use at Surry Power Station Unit Nos. 1 and 2.

The status of the review program-and results to date are included in the attachment.

IE Bulletin 79-0lA was received following the final preparation of the attachment.

As explained in the attachment, we have several ASCO solenoid valves which we have classified as suspect and which we intend to upgrade or replace as soon as possible.

Information regarding the specific app1i-cations of these valves and corrective actions will be provided in a subse-quent submittal.

cc:

Mr. James P. O'Reilly, Director Office of Inspection and Enforcement Region II Very truly yours,

~ )??. ~~itc~r C. M. Stallings Vice President-Power Supply and Production Operations

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79062?0 1~/ Q

Introduction e

Environmental Qualification of Safety Related Electrical Equipment Surry Power Station Unit Nos. _!_ and I In response to IE Circular 78-08, a program was established to review the environmental qualification of safety related electrical equipment in use at Surry Power Station Unit Nos. 1 and 2.

The environmental gualification review program includes all electrical equipment required to function under accident conditions and which is located in areas where the accident itself could adversely affect the ability of the system to perform its safety function.

The review program is not limited to equipment inside containment but will include equipment in any area of the station where the environmental conditions during an accident are significantly different from normal operating conditions.

Accident Environments

.A prerequisite to the qualification of safety-related electrical equipment is the determination of the environmental conditions to be expected under accident conditions at various locations within the station.

Since the accident environmental conditions specified in the Surry FSAR were not sufficiently de-tailed, we direct~d our architect engineer to provide estimates of Loss of Coolant Accident (LOCA) and Main Steam Line Break (MSLB) environments for plant locations including the containme.nt, the safeguards area, the main steam valve house, and the auxiliary building.

At this time, only the accident environ-ments inside contairnnent have been detennined.

For this reason, only the electrical equipment inside containment will be discussed in this submittal.

The qualification of electrical equipment in locations outside containment will be addressed in subsequent submittals.

The environmental conditions expected inside the containment during a LOCA and a MSLB are shown in Figures l through 5 and in Table 1.

Since most test facilities currently in use cannot simulate the high 'temperatures of the steam break transient, very few tests are available which include the high temperatures experienced in a steam break.

However, since the temperature during a steam break exceeds 300°F for only approximately 100 seconds, testing for significantly longer periods at somewhat lower temperatures has been judged as sufficient qualification in some instances as noted in Table 2.

Classifications~ Qualification Due to the age of the Surry station, explicit qualification data is not readily available for much of the electrical equipment~

As a result, we have had to rely on numerous sources of information.

Due to the diversity of sources and the brevity of some test summaries, there are several gradations of qualifi-cation.

We have categorized all electrical equipment by the degree of qualifica-tion into four classifications as listed below.

All equipment discussed in system summaries or in equipment lists (Table 2) will be assigned to one of. these cate-gories.

---i

2

1.

Explicitly Qualified - qualified under test conditions which equal

• or exceed, in all parameters, the accident environment.for Surry.

2.

Implicitly Qualified - judged to be qualified for one or both of the fol1owing reasons.

a)

Equipment is sufficiently similar to equipment which has been qualified so that qualification is implied.

b)

Equipment has been qualified under test conditions which are sufficiently similar to the Surry accident environment so*

that qualification is implied.

Note:

In many cases, equipment has been placed in one of the above classifications based on brief summaries of tests provided by various industry sources.

For many such items we have not yet received or reviewed the specific test data and methods.

Accordingly, many of these classifications must be considered tentative.

These items are denoted "test review incomplete" in Table 2.

3.

Insufficient Information - equipment for which the available information is insufficient to determine qualification or non-qualification.

4.

Not Qualified -

equipment judged to be non-qualified for one or more of the following reasons.

a)

Equipment has failed under conditions which are equal to or less severe than Surry accident conditions.

b)

Equipment has failed under conditions which are sufficiently similar to Surry accident conditions so that non-qualifica-tion is implied.

c)

Equipment is sufficiently similar to equipment which has failed; environment qualification so that non-qualification is implied.

3 Qualification Status of Safety Related Electrical_ Equipment Inside Contairnnent Qualification data will be presented in both a systems format and in table form by type of component.

Table 2 lists qualification data and sources by type of component.

Following is a summary of the safety-related equipment inside containment and the qualification status for each item.

Equipment is divided into three categories.

1.

Safety System Electrical Components:

motors, motor-operated valves, e*tc.,

and instrumentation which is part of the safety system.

2.

Safety Function Initiation or Post Accident Monitoring Instrumen.tation:

instrumentation which initiates safety system operation or is necessary for post accident monitoring.

3.

Common Equipment:

terminal blocks, electrical penetrations, power cable, instrument cable, etc.

1.

Safety System Electrical Components Nine safety systems are wholly or partially located within the containment:

A)

High Head Safety Injection B)

Low Head Safety Injection C)

Safety Injection Accumulators D)

Containment Spray System E)

Inside Recirculation Spray System F)

Outside Recirculation Spray System G)

Auxiliary Feedwater System H)

Containment Isolation I)

Hydrogen Recombiner A)

High Head Safety Injection System The only electrical equipment in this system inside containment is six flow transmitters which indicate safety injection flow.

There is one transmitter in each of three cold leg injection li_nes and one in each of three hot leg injection lines.

Equipment Type Safety Injection Flow Transmitters:

Barton Model 386 Resolution Qualification Status Insufficient Information These transmitters will be replaced with instruments of suitable quality as soon as possible.

(Throughout this S\\lbmittal, "replace-ment as soon as possible" will mean that procurement will be initiated immediately and replacement will be completed at the first unit outage of sufficient length following receipt of the hew equipment).

I B)

Low Head Safety Injection System There are no electrical components in this system inside.the containment.

C)

Safety Injection Accumulators 4

The accumulator system is entirely passive, requiring no initiating action.

Tne system is entirely within containment.

Each accumulator has a discharge isolation valve.

These valves are always open and de-energized during operation.

Therefore qualification of these valves is not required.

Each of the three accumulators has two level transmitters and two pressure transmitters.

Equipment Type Accumulator Level Transmitters:

Rosemount Hodel 1152 Accumulator Pressure Transm.i t ter:

Fischer Porter 50EP1031BCXSNS Resolution Qualification Status Implicitly qualified (MSLB and LOCA)

LOCA-implicitly qualified MSLB-insufficient information Accumulator Level Transmitters are acceptable.

More information would be required to evaluate overall acceptability of the pressure transmitters.

However, due to difficulties in the procurement of instruments from this manufacturer, we had previously decided to phase out use of these instruments.

Rather than pursue additionai qualification data or testing, we will accelerate this phase out and will replace the accumulator pressure transmitters as soon as possible.

D)

Containment Spray System There are no electrical components of this system located inside the containment.

E)

Inside Recirculation Spray System The entire inside recirculation spray system, including the following electrical components, is located inside the con-tainment.

1)

Inside Recirculation Spray (IRS) Pumps

2)

Pump discharge pressure transmitters

3)

Pump discharge temperature transmitters (RTD)

4)

Heat exchange outlet temperature transmitter (RTD)

5)

Containment Sump Level transmitters

6)

Containment Sump Temperature transmitters (RTD)

5 Equipment Type Qualification Status

1)

IRS Pump Motors:

Qualified General Electric-Tri/Clad Vertical Hi-Thrust Polyphase Induction Motor:

GEH-1897B LOCA MSLB insufficient information

2)

IRS Pump Discharge Pressure Transmitter Fischer Porter 50EP1031BCXANS 3, 4, and 6)

Pump discharge, heat exchanger outlet, and sump water temperature:

Electric Thermometer (200 ohm platinum RDT)

5)

Containment Sump Level Transmitter:

Foxboro 617B4-MCA Resolution LOCA - implicitly qualified MSLB - insufficient information LOCA/MSLB - insufficient information*

LOCA/MSLB - insufficient information The IRS pump motors are tentatively judged acceptable; however, some additional information is necessary to confirm acceptability under steam break conditions.

Rather than pursue additional qualification data on the pump discharge pressure transmitters, and in view of past procurement problems with this manufacturer, we will replace these transmitters as soon as possible.

~

Items 3,4,5 and 6 are all of questionable qualification.

However, only items 5 and 6, sump level and sump temperature transmitters are considered sufficiently important to warrant corrective action.

Accordingly, sump level and sump temperature transmitters will be replaced as soon as possible.

F)

Outside Recirculation Spray (ORS) System The only electrical components of this system which are inside containment are two heat exchanger outlet temperature detectors (one on each heat exchanger).

Equipment Type ORS Heat Exchanger Outlet Temperature Detectors:

Electric Thermometer (100 ohm platinum RTD)

LOCA/MSLB-insufficient information

6 Resolution These instruments are not essential under accident conditions and, therefore, do not require qualification.

G)

Auxiliary Feedwater System The only electrical components of the auxiliary feedwater system which are located inside containment are 6 motor operated valves (2 auxiliary feed flow paths to each of three steam generators.,

one HOV in each flow path).

These MOV's are normally open and receive signals to open on auxiliary feedwater initiation.

Since these valves are left open, it is not necessary for these MOV's to function to initiate auxiliary feedwater flow.

These valves

.can be used to modulate auxiliary feedwater flow if required.

Equipment Type Auxiliary Feedwater MOVs:

Limitorque Smb-0, Class B Insulation Motor Resolution Qualification Status LOCA MSLB implicitly qualified insufficient information These MOV's are tentatively judged acceptable; however, some additional information is necessary to confirm acceptability.

H)

Containment Isolation All containment isolation trip valves are of the.air operated, vent-to-close type.

As such, the only electrical equipment re-quired for valve closure is the air control solenoid.

Note that failure of the solenoid will vent control air, closing the isolation valve.

Several types of solenoids are in use as follows Each containment isolation valve has one or more limit switches.

Equipment Type Containment Isolation Valve Air control solenoids:

ASCO Model 8320Al02 ASCO Model X8320Al2 ASCO Model HB 830281RF A~CO Model LB831654 Valve Limit Switches Fischer 304 Hicro-Switch BZE6-2RN Namco's D2400X Qualification Status not qualified insufficient information insufficient information insufficient information insufficient information insufficient information not qualified (previot,1Sly reported in response to IE Bulletin 78-04)

e 7

Resolution Asco Hodel 8320Al02 solenoids have previously beet; reported as not qualified (letter of June 14, 1979, Serial No. 466).

These solenoids have been replaced on Unit No. 1 and will be replaced on Unit No. 2 prior to start-up.

While we have no data on other Asco solenoids, we consider all such solenoids suspect and will replace them as soon as possible. All safety-related limit switches will be replaced as soon as possible.

I)

Hydrogen Recombiner Each containment has one hydrogen recombiner for post accident hydrogen removal.

• Equipment Type Hydrogen Recombiner:

Qualification Status insufficient information.

Westinghouse Resolution Further investigation is required to determine the qualification status of

.the hydrogen recombiners.

2.

Instrumentation This category includes instrumentation which provides safeguards initiation or which is necessary for post accident monitoring.

A)

Consequence Limiting Safeguards (CLS) Initiation The CLS system.actuates in two phases in response to increases in containment pressure.

Setpoints and major functions actuated are as follows:

CLS HIGH:

3 out of 4 contairL~ent pressure transmitters equal to or greater than 3.0 psig.

Initiates safety injection, Phase II contain-ment isolation, and trips' containment vacuum pumps.

CLS HIGH-: 3 out of 4 containment pressure transmitters HIGH equal to or greater than 8.3 psig.

Initiates all spray systems and associated alignments.

Initiates Phase III containment isolation.

CLS HIGH and CLS HIGH-HIGH are actuated. by contairm1ent pressure transmitters which are located outside containment.

B)

Safety Injection Initiation 8

Safety injection, which activates high head injection, low head injection, reactor trip, auxiliary feedwater, Phase I containment isolation and other safety functions, is initiated in a.ny one of five ways:

1)

Pressurizer low pressure coincident with pressurizer low level.

Note: The above is the system design coincidence.

In accordance with IE Bulletin 79-06,06A, all pressu-rizer level bistables have been placed in the trip mode yielding safety injection initiation on low pressurizer pressure only.

2)

High differential pressure between the main steam header and any steam line.

3)

High steam line flow with either 1) low reactor coolant temperature or 2) low steam line pressure.

4)

CLS High

5)

Manual Locations of the above listed parameter sensors are as follows:

Pressurizer pressure - inside containment Pressurizer level - inside containment Steam line flow - inside containment Reactor coolant temperature - inside containment Steam header pressure -

turbine building Steam line pressure - main steam valve house Qualification status for safety injection initiating instruments inside containment is as follows:

Equipment Type Pressurizer Pressure Transmitters:

Fisher Porter 50EP1041BCXANS Pressurizer Level Transmitters:

Barton 386 Reactor Coolant Temperature (RTD):

Rosemount 176KF Rev. H Steam Flow Transmitters:

Fisher Porter 10B2496QB Qualification Status LOCA-implicitly qualified MSLB-insufficient information insufficient information LOCA -

qualified MSLB~implicitly qualified insufficient information

I

3.

e 9

Resolution The pressurizer pressure transmitters and the steam flow transmitters will be replaced as soon as possible due_ to the. procurement problems discussed earlier.

The pressurizer level transmitte_rs will be replaced as soon as possible.

The reactor coolant temperature detectors are judged acceptable.

C)

Pust Accident Monitoring Instruments In addition to the instruments listed above, steam generator level and reactor coolant wide range temperature and wide range pressure are of use in monitoring system conditions following an accident.

Equipment Type Steam generator level:

Barton 386 Reactor coolant loop wide rarige temperature:

Ro'semount 176KS Rev. C.

Reactor coolant system wide range pressure:

Ashcroft 1079 TAS Maxisafe Resolution Qualification Status insufficient information qualified insufficient information The steam generator level transmitters will be replaced as soon as possible.

The reactor coolant wide range RTD's are considered acceptable.

Reactor coolant wide range pressure instrumentation will be replaced as soon as possible.

Common Components A)

Electrical penetrations B)

Junction Boxes and Terminal Blocks C)

Cable D)

Splices A)

Electrical Penetrations Electrical penetrations function to provide a leak-free passage of electrical conductors through the containment wall.

These penetrations are part of the containment isolation boundary and are, therefore, required to maintain their integrity under accident conditions.

Penetration Coil.ax Amphenol Resolution Qualification Status qualified -

implicitly qualified 10 The Conax penetrations are judged acceptable.

Amphenol penetrations are tentatively judged acceptable, pending further review of their resistance to radiation.

B)

Junction Boxes and Terminal Blocks C)

Cable terminations at equipment are typically to terminal blocks enclosed in metal junction boxes or to terminal blo.cks integral with the instrument case.

Where. termi-nations are made in junction boxes, qualification infor-mation is not available.

Terminations at integral tenninal blocks are implicitly qualified with the instrument.

Qualification status is as follows:

Terminal Type Separate Junction Box Integral Terminals Resolution Qualification Status no information implicitly qualified

,;.,"'ith instrument Instrument integral terminations are considered accepta-ble for qualified instruments.

(Unqualified instruments are being replaced with qualified instruments and thus, these terminations will be qualified).

Terminations at junction boxes require further investigation and where deemed not-qualified will be replaced with qualified terminations (qualified terminal blocks or splices) as soon as possible.

Electrical Cable Electrical cables are classified as either po"wer or instrumentation cables, and supply power or control signals to the various electrical components.

The following cable types are used:

Cable Instrument Cable Continental/Anaconda Cerro Collyer Lewis Engineering Qualification Status LOCA/MSLB Qualified LOCA/MSLB Implicitly Qualified LOCA/MSLB insufficient information LOCA/MSLB insufficient information

I I

Power Cable Continental/Anaconda Cerro Resolution e

LOCA/HSLB insufficient information LOCA/HSLB irnplictly qualified Cable implicitly qualified requires additional review of test methods and results.

Cable listed as insufficient information will be investigated further to determine acceptability.

Continental instrument cable is considered acceptable.

D)

Splices All splices used in containment at Surry are qualified Raychem splices.

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F-igure 5

TABLE 1 SURRY POWER STATION UNITS 1 & 2 LOCA/MSLB CHEMICAL SPRAY TIME AFTER SRPAY INITIATION 0 to 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> 2 to 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> CHEMICAL SPRAY DESCRIPTION 2500 ppm borated water (as boric acid) with NaOH added 9.0ipH".:11.0 2500 ppm borated water (as boric acid) with Na OH added 7.0~pH:'.:'9.0

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SURRY l.& 2 TABLE 2 Page 2 of 6 ENV!RONMENT (LOCATION)

ITEM I Pressure Tran~mitters I

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-~.J

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TAELE 2 page *5 of 6

\\

i.:NVIR8NMENT (LOCf\\TION)

I I

I T

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QU(1L.

~---+--E"_()c...ciJc..I,c.._P.c...MrJiT DESCRIPTION Pr'\\_RA!*JHrn

_I, ____ SPEC.

l.

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I METHOD*

J

\\

I I I *I TE:~1 I

DOC.

F.EF,1-*

21

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~

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TABLE 2 page 6 of 6 I

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rnv~rm:i,*1ENT (LOC/\\TIOil)

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PMU\\METrn ~

~PEC.

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1 ITEi*!

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r '" I o_,,___

r..

I

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. 1

• 2 7 5.

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I

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~

lJ l

TABLE 2 SUPPLEMENT QUALIFICATION REFERENCE DOCUMENTS

1.

Franklin Institute Research Laboratory Report F-C2857.

2.

Cerro's Supplement to F.I.R.L. Report F-C2857.

3.

Topical report on G.E. Vertical Induction Motors Inside Containment Recirculation Spray Pump Motors, GE Company June 12, 1979.

4.

Continental Cable test report, Conax Report No. IPS-383, 11-29-78.

5.

Franklin Institute Research Laboratory Report F-C223201.

6.

Limitorque Project 600461, Test Report No. B0003.

7.

Hyle Laborabory Test Report No. 26304 dated 12-12-78.

8.

IE Bulletin 78-04 Namco Limit Switches.

9.

Westinghouse letter NS-CE-1179, 8-26-76.

10.

Vepco letter Serial 424, PSE&CiJND, 3...:.2:2~78.

11.

Rosemount Test Report 117415 Rev. A 9-24-75.

12.

F.I.R.L. Test Report F-C4539.

13.

Conax Test Report IPS-107, 10-5-73.

14.

D. G. OTBrien, Inc., Test Report No. Cl9QA061, 2-28-72.

J.5.

Fischer & Porter Engineering Report No. DP-2204-51-B-006, 1968.

16.

Raychem Technical Report F-C4033, Ja., 1975.