ML17276B686

Forwards Recommendations on Proposed Plant Operating Procedure Changes,Equipmemt Mods & Discussion of Design Basis Ashfall.Advance Warning Arrangements in Section Ii.A. Fulfill Commitment Per Supplemental SER Section 2.5.1.3.1

ML17276B686
Person / Time
Site:	Columbia
Issue date:	10/04/1982
From:	Bouchey G WASHINGTON PUBLIC POWER SUPPLY SYSTEM
To:	Schwencer A Office of Nuclear Reactor Regulation
References
GO2-82-825, NUDOCS 8210210049
Download: ML17276B686 (13)

Text

rA/l' REGULATOR'INFORMATION DISTRIBUTION SQ'EM (RIDS)

ACCESSION NBR:8210210049 OUC DATE: 82/10/04

~ NOTARIZED; NO DOCKET FACIL:50 397 'KPPSS Nuclear Project~ Unit 2E Washington Public Pose =05000397 AUTH, NAME AuTHOR AFFILIATION BOUCHEY~G ~ DG washington Public Power Supply System

~RECIP ~ NAME RECIPIENT AFFILIATION SCHHENCERgA ~ Licensing Branch 2

SUBJECT:

Forwards recommendations on proposed plant operating e changesrequipmemt mods 8 discussion of design 'l'ocedur basis ashfali,Advance warning arrangements in 'Section II.A.

fulfull commitment per supplmental SER Section 2 ~ 5 ~ 1,3 ',

DISTRIBUTION CODE: B001S COPIES RECEIVED:LTR . ENCI SI'ZE:..

TITLE: Licensing Submittal: PSAR/FSAR Amdts 8 Related Correspondence NOTES:

REC IP IENT COPIES RECIPIENT COPIES IO CODE/NAME LTTR ENCL IO CODE/NAME LTTR ENCL NRR/DL/ADL 1 0 NRR LB2 BC '=1 0 NRR LB2 LA 0 AULUCK,R. 01 1 INTERNAL; ELO/HDS2 1 0 IE FILE 1 1 IE/OEP EPDS 35 1 IE/OEP/EPLB 36 3 3 NRR/DE/AEAB 1 0' NRR/DE/CEB 11 1 1 NRR/OE/EQB 3 NRR/DE/GB 28 2 2 NRR/OE/HGEB 30 2 NRR/OE/MEB 18 1 NRR/OE/MTEB 17 1 1 NRR/DE/GAB 21 1 1 NRR/OE/SAB 2q 1 1 NRR/DE/SEQ 25 1 1 NRR/DHFS/HFEBOO 1 1 NRR/OHFS/LQB 32 1 1 NRR/DHFS/OLB 34 ,1 1 NRR/DHFS/PTRB20 1 1 NRR/DSI/AEB 26 1 NRR/Ds I/ASB 27 1 1 NRR/DSI/CPB 10 1 1 NRR/DS I/CSB 09 1 1 NRR/DSI/ETSB 1? 1 NRR/OS I/ICSB 16 1 1 NRR/OS I/PSB 1 1 NRR/DSI/RAB 22 1 1 NRH DS-I,...SB 23 1 NRR/DST/LGB 33 1 1 FILE 04 1 1 RGN5 2 2 R /DDANI1 IB .0 EXTERNAL: ACRS 6 BNL(AMDTS ONLY)

DMO/Dss (AMOTS) 1 FEMA REP DIV 39 LPOR 03 NRC PDR 02 NSIC 05 1 r1 1 NTIS TOTAL NUMBER OF COPIES REQUIRE,O; LTTR 55 ENCL 09

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Washington Public Power Supply System P.O. Box968 3000 George Washington Way Richland, Washington 99352 (509) 372-5000 October 4, 1982 G02-82-825 Docket No. 50-397 Hr. A. Schwencer, Chief Licensing Branch No. 2 Division of'icensing U.S. Nuclear Regulatory Comission Washington, D.C. 20555

Subject:

NUCLEAR PROJECT NO. 2 VOLCANIC ASHFALL PROTECTION

Reference:

Letter G02-82.-.576, G.D. Bouchey (SS) to A. Schwencer (NRC), "Volcanic Ashfall Protection", dated July 1, 1982 The referenced letter described a task force the Supply System formed to study the impact of volcanic ashfall on the WNP-2 site. This task force has completed its study. Sixty (60) copies of their recommendations on proposed plant operating procedure changes, equipment modifications, and discussion of design basis ashfall are enclosed.

The advance warning arrangements discussed in Section II.A of the enclosure fulfill our commitment as described in SSER Section 2.5.1.3.1.

Based on our review of the impact of a design basis ashfall on the plant, we have concluded that incorporation of the task force recommendations in plant procedures and design will provide further assurance of safe plant operation and shutdown following such an event.

82i004 Pool 82i02i0049 05000397 PDR ADOCK PDR l E

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Mr. A. Schwencer, Chief Licensing Branch No. 2 Page Two October 4 1982 Volcanic Ashfall Protection With this submittal all information necessary to close confirmatory issue 1.8(24) of the WNP-2 Safety Evaluation Report Supplement No. 1 has been provided.

Very truly yours, G. D. Bouchey Manager, Nuclear Safety and Licensing CDT/Jw Enclosure cc: R. Auluck - NRC W.S. Chin - BPA R. Feil - NRC Site

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DESIGN BASIS ASHFALL The design basis volcanic ashfall, as presented in the result of extensive research and analysis performed by WNP-2 FSAR, is the Woodward-Clyde Con-sultants and the Supply System. Since the majority of historic measurements of volcanic ashfall were taken with the ash in a compacted state, the Supply System considers this information to be the most reliable for Engineerng calculations.

The following table compares the results of calculated ash values using infor-mation from the WNP-2 FSAR, the WNP-2 SER (NUREG-0892 Supplement No. 1, August 1982) and the May 18, 1980 Mt. St. Helens eruption. Although we believe the FSAR values to be a better approximation of actual conditions during a Design Basis Ashfall, the more conservative figures from the SSER, coincident with the loss of offsite power for two hours, were used to evaluate the WNP-2 plant systems and equipment with regard to operability and reliability during a Design Basis Ashfall. This evaluation has resulted in proposed revisions to operating procedures and modifications to equipment to ensure that the plant could operate safely and achieve safe shutdown following a Design Basis Ashfall. These proposed changes are described in Section II and III.

Mt. St.

Helens 1980 FEAR SEER Maximum Ashfall {in) uncompacted 2.75 5.00 7.4 compacted 1.65 3.00 3.00 k

Ashfall Duration (hrs) 20 20 20 Ashfall Rate (in/hr) Average .14 .25 .35 k j Maximum .21 .35 .44 Average Grain Size (um) 75 75 75 Density (lbs/ft ) compacted 96 96 96 Compaction ('A) 40 40 60 3

Air Concentration (ugm/m ) Average 69,795 124,634 174,488 Maximum 104,693 155,793 219,536

I I

I. PROCEDURE

REVISIONS A. Emer enc Plan Im 1ementin Procedure The Emergency Plan and Implementing Procedures contain provisions for notification of personnel and activation of appropriate emergency centers for the effective management of emergencies at WNP-2. Arrangements have been made for advance notification of ashfall to the Supply System via NAWAS receivers to be installed in the Security Communications Control Center (SCCC) at the Supply System's Multi-Purpose Facility and in the near-site Emergency Operations Facility. Information provided will include, if available, the predicted ash plume arrival .time, the expected ash fall duration, and the plume conditions. The Plant Emergency Director will be notified by the SCCC operator and will use the information to evaluate the emergency and activate the appropriate components of the Emergency organization. In general, an unusual event will be declared for volcanic activity resulting in visable airborne ash at the WNP-2 Site. If condi-tions warrant, non-essential personnel will be evacuated from the site and dust masks will be dispensed to Emergency personnel.

B. Plant 0 eration Procedures

1. Safety Instrumentation Reactor coolant injection, nuclear boiler, and primary coolant and purging systems. Check for secured enclosures and sedimen-tation in pressure sensing line.

2. Spray Pond Monitor temperature and level readings.

3. Air Compressors Monitor draft gages on suction -lines.

4. Diesel Generators Install roughing filters, set up air handling units for recir-culation mode, and lower heat loads.

5. SW Pumphouses Check instrumentation and set up HVAC for recirculation mode.

6. Control Room Replace air handling unit filter with high dust capacity type.

7. RB critical switch gear area HVAC.

Set for minimum outside air flow.

8. RB Emergency Pump Rooms, and Critical NCC Rooms.

Lower heat loads, install roughing filters on room air inlets, and monitor room temperatures.

9. RB HVAC Set up air inlet scrubber systems, minimize negative pressure, reduce air flow to minimum, lower heat loads, monitor filter dp gages, and monitor temperature.

10. RW Building HVAC Set up air inlet scrubber system, minimize negative pressure, lower heat loads, monitor filter dp gages, and monitor temper-atures.

TG Buidling HVAC Set up air inlet scrubber system, reduce air flow to minimum, set up positive pressure mode, lower heat loads, and monitor temperatures.

12. CW Pumphouse HVAC Reduce air flow to minimum, monitor air conditioner filter dp gages and install temporary filters on water pump motor ai'r intakes.

13. MU Water Pumphouse HVAC Lower heat loads, alternate air handling unit operation, and monitor dp gages on filters.

14. Cooling Tower Electric Building HVAC Close outside air dampers, set up air conditioning unit for recirculation mode, lower heat loads and monitor dp gages on filters.

15. Fire Protection System Install roughing filter on air inlet of pumphouse No. 3, and monitor a draft gage on diesel combustion air cleaning system.

16. Structures Monitor-ash levels.

17. Train A (Division 1 Emergency Power)

a. Diesel Generator Install roughing filters, set up air handling units for recirculation mode, and lower heat loads.

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b. ADS Set up system.

c. RHR-"A" Complete valve line up, check instrumentation and install roughing filter on room air inlet.

d. SW-"A" Comp'fete valve line up, check instrumentation and set up SW pumphouse HVAC for recirculation mode.

18. Train B (Division 2 Emergency Power)

a. Diesel Generator Install roughing filters, set up air handling units for recirculation mode, and lower heat loads.

b. RCIC Complete valve line up, check instrumentation, and install roughing filter on room air inlet.

c. RHR-"8" Complete valve line up, check instrumentation, and install roughing filter on room air inlet.

d. SW-"8" Complete valve line up, check instrumentation, and set up SW pumphouse HVAC for recirculation mode.

e. ADS Set up system.

III. E UIPMENT MODIFICATIONS

1. Circulating Water Pumps Install filter frames on pump motor air intakes.

2. Fire Protection Install filter frames and dp gages on fresh air inlet to Well Water Pumphouse No. 3 and install draft gage on diesel air cleaning system.

3. RHR Pump Rooms Install ductwork to hold filters for filtration of Reactor Build-ing supply air, and install dp gages to assess filter condition.

4. RCIC Pump Rooms Install ductwork to hold filters for filtration of Reactor Build-ing supply air, and install dp gages to assess filter condition.

5. Diesel Generator Building Install filter frames for filtration of outside air and install dp gages to assess filter condition.

6. Service Water Pump House Install filter frames for filtration of recirculated air through cooling coils and install dp gages to assess filter condition.

7. Reactor Building Emergency Pump Rooms Install filter frames for filtration of Reactor Building supply air, and install dp gages to assess filter condition.

8. Reactor Building Critical flCC Rooms Install filter frames for filtration of Reactor Building supply air, and install dp gages to assess filter condition.

9. Instrument Air Compressors Install suction gages and fine filters.

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