ML20033D824
| ML20033D824 | |
| Person / Time | |
|---|---|
| Site: | Fermi, Grand Gulf, Susquehanna, Columbia, LaSalle, Shoreham File:Long Island Lighting Company icon.png |
| Issue date: | 10/03/1983 |
| From: | Liaw B Office of Nuclear Reactor Regulation |
| To: | Vollmer R Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML082410577 | List: |
| References | |
| FOIA-92-463 NUDOCS 8310130348 | |
| Download: ML20033D824 (3) | |
Text
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. 3-A OCf 3 1983 vi
- M NOTE TO
R. Vollmer, Director, DE THRU:
William V. Johnston, AD:MCET FROM:
- 3. D. Liav, Chief, MTEB
SUBJECT:
1GSCC CN NTOL EVR PLWTS f
of Ae..; 20 icquesting informatice Tuin is la usyvu.c Lv yvu uvic s
regarding steps taken at six BVR plants to mitigate intergranultz stress corrosion of stainless steel veldments.
A review vas cade of the information present in the FSARs and in other available correrpondence Scme plants are constructed in pairs. Often, the ISAR dccs not differentiate the steps taken at individual units to mitigate IGSCC, while other sources of information show that there are differences between sister units. Most discussions in the FSAR are vegue.
Some systems, such as Head Spray, Standby Liquid Control, Instrument Piping, nd B;ttem Dr:1:: sre rarely covered in the FSAR. Some of these systems, such as Head Spray and Bottom Drain, can have moderately sized piping diameters (4 to 6 inches).
Reactor Vater Clean Up systems are frequently ignored in the FSARs.
This system shculd be of particular concern to the staff because of
'ha H 8 r=Ai=' inn re.ncent r a t ed in this system. and the attendant radiation exposure tt. weirkers repairing or replacing this particular system.
Plants are discussed in the same order as in your note.
LA SAlLE 2 The FSAR does not differentiate between Units 1 and 2.
No statements were made about using nuclear grade material in any system. All of the Peactor Recirculation (RCC) piping is 304, and the only mitigation is that the jet pump riser piping assemblies have been solution treated after fabrication of elbows to pipe.
Induction heating stress improve-ment (IHSI) is being considered for the RRC before start up.
The RRC system pump discharge bypass and CRD return lines have been eliminated.
Stainless steel has been removed f rom the core spray, LPCI, reactor water clean up systems and feedwater nozzles and replaced with carbon steel.
Information is not available for the RHR, HPCI, RCIC, head spray, standby liquid control, and bottom drain systems.
Low carbon austenitic stain-
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less steel grades replaced some pieces of 304 in unspecified systems.
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Otner data indicates there are 80 unmitigated velds in the RRC system.
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R. Vollmer ET 3 1983 i
I VNP 2 The RRC safe ends (10) were replaced with 316L. The inlet riser i
piping assemblies from the safe end to the pipe side of the riser i
to sweepolet were mitigated by solution annealing and buttering of the pipe side with E308L veld metal. The manifold has rose assemblies solution heat treated and would be considered as being mitigated in part. Core spray piping is carbon steel. The RRC pump discharge bypass and CRD hydraulic return lines were elisinated.
In the RHR system, limited portions of the shutdown cooling returns (one spool each loop,2 loops) are 304 vith no mitigation. Balance of the system is carbon steel. Information is not available on the LPCI, HPCI, RCIC, head spray, and bottom drain systems. The standby I
liquid control and reactor water clean up systems have some unmitigated velds. Other data indicates there are 79 uraitigated welds in the RRC system.
SHOREHAM i
The FSAR infomation was augsented by LILCO's SNRC-955 letter dated August 23, I W. 1be Exc has 120 type 304 velds. Of these, 22 have received no mitigation treatment (induction heat stress improvement, IHSI, or solution heat treitment, SHT). These 22 velds were not treated because of weld geometry or physical access problems. Core spray lines and their nozzle safe ends were changed to carbon steel.
i RRC discharge bypass and CKD return lines were eliminated and existing veldolets.ete upped.
Information is not available for the bead spray, standby liquid control, bottom drain residual heat removal, hi h pressure coolant injection, low pressure coolant injection, t
reactor core isolation cooling, and reactor water cleanup systems.
Other data indicates there are 14 unmitigated velds inthe RRC system.
l FERMI 2 2
In the RRC system, the 12 inch diameter riser pipe was buttered at their ends with IGSCC resistant veld metal and then solution heat treated. The RRC pu:rp discharge bypass and CRD retrun lines were eliminated. The balance of the RRC system, 22 and 28 inch diameter j
sections did not have any mitigation.
Induction heating stress improvement is being considered for cany of the remaining unmitigated velds in several systems. The reactor core spray lines were initi-ally carbon steel. The stainless safe ends were removed and replaced with Inconel and carbon steel extension pieces.
Information is not available for head spray, LPCI, HPCI, RCIC, standby liquid control i
and bottom drain systems. RHR and RVCU systems are carbon steel.
Other data indicates there are 52 u:sitigated velds in the RRC system.
t I
R. Vollmer OCT 3 1981 o
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SUSQUERANNA 2 The RRC system risers were mitigated by solution heat treatment of shop welds and 30BL corrosion resistant cladding for field velds.
The CRD return lines were eliminated. IHSI is planned for RRC, core spray, RER and RVCU systems. All stainless steel in other piping systems is indicated in the FSAR to have been 304 stainless limited to.030% maximum carbon or 304L. No concrete information on LPCI, HPCI and RCIC systems. Other data indicates there are 80 unmitigated welds in the RRC system.
ORAXI; OL"2 The FSAR does not differentiate between Units 1 and 2.
Their response to 50.54(f) letter for Unit 1 indicates there are 22 unmitigated velds in the RRC system. For those velds that have l
been mitigated, the approaches ranged from 316L for safe ends to buttering and solution hea*. treatment of velded assemblies.
l IMSI is being considered for the remaining 22 unmitigated velds.
Core spray and RCIC systems are carbon steel. RVCU and RHR systems are mostly carbon steel with 304L components used to provide con-nections with reactor coolant pressure boundary. All other systems in the reactor coolant pressure boundary have been eitigated. Other date indiretes there ere 22 unmitigated velds in the RRC system.
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