ML13330B479

Forwards Nuclear Instrumentation Sys Equipment Qualification Summary Rept.Signals from Lower Section of Two Section Fission Chambers Processed by wide-range Preamplifiers Located Outside Containment Near Penetration Area

ML13330B479
Person / Time
Site:	San Onofre
Issue date:	02/16/1989
From:	Nandy F SOUTHERN CALIFORNIA EDISON CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
NUDOCS 8902220229
Download: ML13330B479 (8)

Text

Southern California Edison Company P. 0.

BOX 800 2244 WALNUT GROVE AVENUE ROSEMEAD, CALIFORNIA 91770 F. R. NANDY TELEPHONE MANAGER OF NUCLEAR LICENSING February 16, 1989 (818) 302-1898 U1. S. Nuclear Regulatory Commission Attention: Document Control Desk Washington, D. C. 20555 Gentlemen:

Subject:

Docket No. 50-206 Nuclear Instrumentation System (NIS) Equipment Qualification (EQ) Summary San Onofre Nuclear Generating Station Unit 1

References:

1) Letter, Kenneth P. Baskin, SCE, to U. S. Nuclear Regulatory Commission, Amendment Application No. 150, Nuclear Instrumentation System Replacement, April 15, 1988

2) Letter, M. 0. Medford, SCE, to U. S. Nuclear Regulatory Commission, Nuclear Instrumentation System (NIS) Replacement, May 27, 1988

3) Letter, F. R. Nandy, SCE, to U. S. Nuclear Regulatory Commission, Docket No. 50-206, January 6, 1989 Reference 1) provided the details of Southern California Edison's (SCE's) plans to install a replacement NIS at San Onofre Unit 1 and stated that a brief description of the environmental qualification (EQ) testing scope and the design basis EQ parameters used would be provided at a later date.

The NIS EQ testing program has been completed and accordingly, the attached summary report describing the NIS EQ test-program isbeing submitted at this time to satisfy our commitment.

If you have any questions regarding the San Onofre Unit 1 NIS EQ testing program, please let me know.

Very truly yours, 8902220229 890216 PDR ADOCK 05000206 P

PNU Enclosures cc: 3. B. Martin, Regional Administrator, NRC Region V F. R. Huey, NRC Senior Resident Inspector, San Onofre Units 1, 2 and 3

NIS ENVIRONMENTAL QUALIFICATION

SUMMARY

I. INTRODUCTION Southern California Edison (SCE) is replacing the San Onofre Nuclear Generating Station (SONGS) Unit 1 Nuclear Instrumentation System (NIS) with a Westinghouse supplied system. All the NIS components requiring environmental qualification (EQ) have been qualified by Westinghouse-and SCE is preparing ten Environmental Qualification Document Packages (EQDP) to document the qualification on each component. In addition to EQ, the NIS was designed to meet Safety Related and Seismic Category A requirements.

II. SYSTEM DESCRIPTION The incontainment portion of the NIS is comprised of neutron flux monitoring detectors which provide two Source Range (SIR), two Intermediate Range (I/R) and four Power Range (P/R) channels. The excontainment portion of the NIS consists of 14 drawers and two panels which contain various plug-in type modules that perform the functions for the S/R, I/R, P/R and auxiliary channels. There are four separate instrumentation channels which comprise the NIS.

For EQ purposes, only the incontainment equipment and the wide range preamplifier are discussed in this summary. The following components are shown in the one-line diagram, Figure 1:

A. SOURCE RANGE (S/R) CHANNELS The S/R channels consist of a (BF3) detector and quartz insulated stainless steel clad triaxial cable with Amphenol connector, Rockbestos triaxial cable with crimp-on connector and Westinghouse penetration with Rockbestos triaxial cable pigtails and Amphenol connectors. The S/R channels are not required for post-accident monitoring.

B. POWER RANGE (P/R)CHANNELS Two of the four power range P/R channels consist of an uncompensated ion detector with mineral insulated triaxial hardline cable with an.Amphenol connector, Rockbestos triaxial cable with crimp-on connector, and Westinghouse penetration with Rockbestos triaxial cable pigtails and Amphenol connector. The P/R channels are required one minute post accident to perform an overpower trip function.

C. WIDE RANGE (I/R AND P/R) CHANNELS Each wide range channel utilizes the lower section of a two-section fission chamber, for the I/R channel ( Regulatory Guide 1.97 range channel). The upper section of the chamber consists of a P/R detector with mineral insulated stainless steel clad triaxial cable and Amphenol connector, Rockbestos triaxial cable pigtails with

-2 crimp-on connector and Westinghouse penetration with Rockbestos triaxial cable and Amphenol connector. The P/R channels are required one minute post-accident.

The lower section of the chamber consists of a I/R and P/R Regulatory Guide 1.97 range detector with quartz insulated nickel clad triaxial cable and Swagelok connector seal assemblies, quartz insulated nickel clad triaxial cable with Swagelok seal assemblies on both ends, quadax cable with Swagelok connector seal assemblies on both ends and Westinghouse penetration with quadax cable pigtails and Swagelok connector seal assemblies. The Regulatory Guide 1.97 channel is required to perform post-accident monitoring functions.

D. WIDE RANGE PREAMPLIFIER The signals from the lower section of the two section fission chambers are processed by wide range preamplifiers located outside containment near the electrical penetration area. With few exceptions outside containment NIS equipment is not environmentally qualified since the applicable areas are not considered harsh post accident environments. However, an EQDP was prepared since elevated temperature and high radiation are possible post accident at the preamplifier location. The preamplifier is a Neutron Flux Monitoring System (NFMS) Preamplifier E-3789. The preamplifier major components are a current output circuit and a multipin connector. The amplifier is required to perform post-accident functions for the Regulatory Guide 1.97 channels.

E. ELECTRICAL PENETRATION The NIS uses four electrical penetrations designed by Westinghouse specifically for their nuclear instrumentation systems.

The electrical penetration consists of a penetration module and a bulkhead assembly. The electrical penetrations are required post accident.

III.

DESIGN CRITERIA The SONGS Unit 1, Retrofit General Design Criteria (RGDC) Manual, Document No. M-37387, Revision.7 governs the design for the system components and structures associated with the NIS upgrade including the normal environmental, post accident environmental, and seismic criteria. The specific NIS criteria is contained in the document Design Criteria Nuclear Instrumentation System for San Onofre Nuclear Generating Station, Unit 1, M86281.

-3 The NIS is classifed as Safety Related and Seismic Category A. The NIS applicable codes and standards are listed in the RGDC. NIS provides input to the Reactor Control and Protection System (RCPS). The RCPS protection functions are governed by SONGS Unit 1 Provisional Operating License No. DPR-13, Appendix A, Technical Specification 2.1, 3.5 and 4.1.1.

The NIS also provides Regulatory Guide 1.97 monitoring functions which requires that those portions should be environmentally qualified.

IV. ENVIRONMENTAL QUALIFICATION All the Westinghouse EQ reports for NIS equipment in harsh areas are being incorporated into the SCE EQDP process. The EQDPs document that each NIS component meets the site-specific parameters at SONGS Unit 1. Regulatory Guide 1.97, Rev. 2, and 10CFR50.49 apply to portions of the NIS which covers three environmental areas (i.e., inside containment, annulus and breezeway).

A. ENVIRONMENTAL QUALIFICATION DOCUMENT PACKAGE (EODP)

Westinghouse completed EQ testing involved five different sets of components: (1) electrical penetration, (2) wide range preamplifier, (3) Quadax Cable/connector seal assembly, (4) two-section fission Chamber and (5) Amphenol Crimp-On connector.

SCE is documenting the environmental qualification of each NIS component by preparing ten EQDPs. The Westinghouse test reports are being broken down so that each component has its own EQDP. The EQDP process essentially formats and reinforces the Westinghouse environmental qualification to comply with the SCE EQ Program.

The triaxial cable qualification is based on a test done by the Rockbestos Company.

Actual test parameter margins are shown in the EQDPs.

Certification that the equipment tested is identical to the equipment used at SONGS is provided in the EQDP. All references and applicable test reports are identified in the EQDPs.

Justifications for differences or descrepancies between the tested and installed equipment or the tested and required parameters are also provided in the EQDP.

As required by 10CFR 50.49 b (2), interactions between the environmentally qualified NIS portions and equipment not required to perform a post accident safety function are also evaluated and documented in the EQDP. This is part of the documentation qualifying the EQ component, and applies to interactions with equipment whether safety related or non-safety related.

-4 B. ENVIRONMENTAL PARAMETERS The NIS is located in three environmental areas - IC (Inside Containment),

1C.1 (Annulus) and 1C.2 (Breezeway) as identified in the RGDC. The environmental test parameters for the NIS EQ components are as follows:

o Thermal Aging 30 year at 120 0F Service Temperature o

Radiation Aging Normal 6 x 106 Rads Gamma Accident 2 x 107 Rads Gamma 2 x 108 Rads Beta o

Chemical Rate of Spray, gpm 1080 Boron, as elemental Boron, ppm 4300 Ph, O to 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> 4.5 - 7.0 after 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> 7.0 - 7.5 Hydrazine, maximum ppm 154 o

Humidity 100%

The post-accident temperature and pressure curves are shown in Figures 2 and 3. Functionality during post accident aging is demonstrated and documented in each EQDP.

2051L

QUARTZ INSULATED FIELD CONNECTOR SIDE 5.S CLAD TRIAX CRIMP -O0 CONNECTOR AMPHENOL CONNECTOR S/R.--*.

DETECTOR PEEllERATICN S/R DETECTOR, QUARTZ TRIAX VITH AMPHENOL CONNECTOR ROCKBES OS TRIAX SOURCE RANGE CHANNEL MINERAL INSULATED FIELD CONNECTOR SIDE S.S CLAD TRIAX CRIMP - ON CONNECTOR AMPHENOL CONNECTOR P/R DETECTOR PENETRATION P/R DETECTOR. MI TRIAX VITH APHENOL CONNECTOR ROCKBESTOS TRIAX POWER RANGE CHANNEL MI S/S CLAD TRIAX VITH CRIMP - ONCONNECTOR AMPHiENOL CONNECTOR**

4 QUARTZ INSULATED NI CLAD TRIAX WITH AMPHENOL CONNECTORS ROCKBESTDS TRIAX (IN CONCRETE) w~iiYoLTGE UADAIAL CABL hFISSION CHAMBER---T POST ACCIDENT AMPHENOL CONNECTORS WITH SWAGELOCK SEAL ASSEMBLIES PtWETRLATICH as AMPHENOL CONNECTORS WIDE RANGE CHANNEL COVERED 31 HEAT SHRINK TUBING FIGURE 1I*

PREAMPS ARE OUTSIDE OF THE PENETRATION IN THE BREEZEWAY

450 407*F 400.

SONGS TEMPERATURE PROFILE USING MARGINS FROM I EEE-323-1974 SONGS

.350 -

LE PROFILE' Z3

/

so*F EC 270*F LU E

m 2E50 SONGS LOCA PROFILE 200 150 100 10 102 103 IO 105 106 2.6x106 TIME (SEC)

TIME (SEC)

TEMPERATURE CONDITIONS FOR EQUIPMENT QUALIFICATION INSIDE CONTAINMENT FIGURE 2

80 70 60 57 PSIG 55 PSIG SONGS PRESSURE PROFILE USING MARGINS FROM IEEE-323-1974 w

50 c-n c-n L CE 40 9PI z

x 30 z

20 SONGS LOCA PROFILE..-

o SONGS MSLB PROFILE 10 PSI 10 0L Oo IO IO IO IO Is I

.6

-10 O0 102 10O1 4

i05 106D 2.6xl106 TIME (SEC)

TIME (SEC)

CONTAINMENT PRESSURE VS. TIME FIGURE 3