ML20213E227
| ML20213E227 | |
| Person / Time | |
|---|---|
| Site: | Columbia  |
| Issue date: | 08/04/1982 |
| From: | Rubenstein L Office of Nuclear Reactor Regulation |
| To: | Novak T Office of Nuclear Reactor Regulation |
| References | |
| CON-WNP-0536, CON-WNP-536 NUDOCS 8208180231 | |
| Download: ML20213E227 (5) | |
Text
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Cocket No:
50-397 MEMORAfiDUM FOR: Thomas Novak, Assistant Director for Licensing, DL FROM:
L. S. Rubenstein, Assistant Director for Core and Plant Systems, DSI
SUBJECT:
SUPPLEMENT TO CHAPTER 9, SAFETY EVALUATION REPORT - WPPSS NUCLEAR PROJECT N0. 2 Plant Name: WPPSS Nuclear Project No. 2 Licensee: Washington Public Power Supply System Docket No: 50-397 Licensing Stage: OL Project Manager:
R. Auluck Systems Integration Branch:
Power Systems PSB Reviewers:
S. Rhow/R. Giardina Review Status: Awaiting Information The enclosed Supplement to the Safety Evaluation for the WNP No. 2 covers the internal corrosion protection for the fuel oil storage and day tanks.
We have found the applicant's design acceptable as noted.
We, therefore, consider the open item in Chapter 9 on fuel oil tank internal corrosion protection in our February 16, 1982 memorandum closed.
6rfgT ZI E & S Sh L. s. Meenstein..j L. S. Rubenstein, Assistant Director for Core and Plant Systems Division of Systems Integration
Enclosure:
As stated cc: See page 2
Contact:
DISTRIBUTION:
R' Giardina s
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Thomas Novak.
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O SUPPLEMENT TO CHAPTER 9 SAFETY EVALUATION REPORT WPPSS NUCLEAR PROJECT NO. 2 9.5.4.2 Emereeney Diesel Eneine Fuet Oil Storace and Tranef.c svstem As stated in the SER, internal corrosion protection for the fuel oil storage tanks as required by Section 7.5'of' ANSI-N195 and Regulatory Guide 1.137 was not being provided.
The 1
applicant has designed the storgge tanks with a 3/16" corrosion atLowance.
External corrosion protection as we'lL as cathodic protection has been provided for the tanks to minimize external l
c o r rosi on.
We require the applicant provide an internal protective coating on the tanks to prevent internal corrosion.
In a letter dated June 4, 1982, the applicant prov'ided justification for not requiring internal prot.ection for the D/G fuel oil storage tanks.
The applicant provided the results of l
a poll of the ANSI Committee responsible for ANSI-N195.
The poll showed that the committee interprets corrosion allowance I
as meeting the corrosion protection requirements of Section 7.5 of the standard.
The staff disagrees with this interpretation.
A corrosion atLowance.is an added safety factor in the system design which take into account the expected corrosion over the Life span of the system.
It does not provide corrosion prote' tion or means to minimize corrosion as required by Regulatory c
Guide 1.37.
The applicant also provided data on failures and problems
associated with internal corrosion coatings.
The^ data supplied showed that various types of coati,ngs have a tendency to peel off.
This resulted in extensive repairs.
Based on the data suppliedi for. fuel oil storage tanks with a coating on the Lower half of the tanks the staff cannot conclude tha't the p r ob,L e m s associated with partial coatingse (peelings etc.)
are applicable for full-internal coatings of fuel oil tanks.
The experience with coatings as presented by the applicant was the basis for his request for relief from the required full internal coating of the storage tank.
On the basis Of the data submittede inspection reports for the unprotected portions of the surveyed tanks showed a negligible amount or absence of corrosions and very Little accumulation in the tanks.
In addition due to meterologic l conditi'ons of the area (L.ow humidity, desert region), periodically (quarterly)
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drainage of water accumulationi use of high quality fuel (water and sediment content less than,0.05% volume), and keeping the fuel oil tanks nearly futli assures the staff that internal corrosion wilL be negligible over the lifetime of the plant.
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On the basis of the abover the staff concurs with the applicant that internal coating of the D/G fuel oil storage tanks is not required.
Thereforer we find the design acceptable.
Based on our reviews we conclude that the emergency. diesel engine fuel oil storage and transfer system meets the
3-requirements of General Design criterin 2, 4, 5 and 17, meets the guidance of the cited Regulatory Guides *and Standard Review Plan 9.5.4, it can perform its design safety function and meets the recommendations of NUREG/CR-0660 and industry codes and standards, and is therefore acceptable.
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