ML19330B079
| ML19330B079 | |
| Person / Time | |
|---|---|
| Site: | Trojan File:Portland General Electric icon.png |
| Issue date: | 06/09/1980 |
| From: | Goodwin C PORTLAND GENERAL ELECTRIC CO. |
| To: | Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| References | |
| IEB-80-05, IEB-80-5, NUDOCS 8007300296 | |
| Download: ML19330B079 (6) | |
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v June 9, 1980 Trojan Nuclear Plant Docket 50-344 License NPF-1 Mr. R. H.
Engelken, Director U. S. Nuclear Regulatory Commission Region V Suite 202, Walnut Creek Plaza 1990 N. California Blvd.
Walnut Creek, CA 94596
Dear Mr. Engelken:
As requested in IE Bulletin 80-05 dated March 10, 1980, a review of the vacuum protection measures for all systems with the potential to contain primary water has been completed for the Trojan Nuclear Plant. The review, which included the systems listed in Attachment A, confirmed the adequacy of existing measures to effectively ensure vacuum protection.
A listing of the evaluated tanks, including specific vacuum protection measures associated with each tank, is presented in Attachment B.
All tanks with active vacuum protection devices (i.e., regulators) have a backup vacuum protection measure. This measure is either the capabil-ity to withstand a full vacuum, a redundant active device or a backup passive means. The CVCS holdup tanks are provided with two active means of assuring vacuum protection. These measures include cover gas from a designated waste gas decay tank and a backup supply from the nitrogen storage facility. PGE considers these measures sufficient to assure vacuun protection.
Installation of vacuum breakers on the holdup tanks is not considered advisable due to the potential for creation of explosive mixtures of oxygen and hydrogen.
?25 L W Esman Steet, Po tand, Creg;n 97204 800730De2 %
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d Mr. R. H. Engelken June 9, 1980 Page 2 4
1 Tanks with passive vacuum protection (i.e., from the vent collection i
header) will be provided with a locking device and an engraved warning on all isolation valves to assure against inadvertent closure. This l
modification will be completed by, June 1, 1981.
I This information completes the PCE input to IE Bulletin 80-05.
Sincerely, i
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j C. Goodwin, Jr.
Assistant Vice President Thermal Plant Operation and Maintenance CG/JLT/4sa3B19 Attachments j
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Mr. Lynn Frank, Director State of Oregon Department of Energy Director Office of Inspection and Enforcement U. S. Nuclear Regulatory Commission l
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ATTACIDIENT A SYSTE51S INCLUDED IN IE BULLETIN 80-05 REVIEW Reactor Coolant System Safety Injection System Chemical and Volume Control System Radioactive Gaseous Waste System Clean Radioactive Waste Treatment System Residual IIcat Removal System Containment Spray System JLT/4sa4A23
i Sheet I of 3 ATTACilMENT B TANK VACUU!! PROTECTION MEASURES Vent Gas Full Collection Loop Collection Equipment Vacuum lleade r Seal lleader Number Service Capacity Capability (Passive)
Rassive)
(Active)
T202 Pressurizer 1080 ft3 water X
720 ft3 steam T203 Pressurizer Relief Tank 1800 f't3 X
X T210A CVCS Mixed Bed 43 f t3 X
Demineralizer T210B CVCS Mixed Bed 43 ft3 X
Demineralizer T211 CVCS Cation Bed 20 ft3 X
Demineralizer T213 Volume Control Tank 400 ft3 X
X T216A Boric Acid Tank 25,510 gal.
X X
T216B Boric Acid Tank 25,510 gal.
X X
T218A CVCS lloldup Tank 8,500 ft3 X
3 T218B CVCS lloldup Tank 8,500 ft X
T218C CVCS Holdup Tank 8,500 ft3 X
T219A Evaporator Feed Ion 30 ft3 X
i Exchanger l
Sheet 2 of 3 ATTACll!!ENT B Vent Cas Full Collection Loop Collection Equipment Vacuum IIcader Seal lleader Number Service Capacity Capability (Passive)
(Passive)
(Active)
T219B Evaporator Feed Ion 30 ft3 resin X
Exchanger Vol. 20 ft3 T219C Evaporator Feed Ion 30 ft3 resin X
Exchanger Vol. 20 ft3 T220A Boric Acid Evaporator 30 ft3 resin X
Condensate Vol. 20 ft3 Demineralizer T220B Boric Acid Evaporator 30 ft3 resin X
Condensate Vol. 20 ft3 Demineralizer T221A CVCS !!onitor Tank 21,600 gal.
X T221B CVCS Monitor Tank 21,600 gal.
X T222 Primary Water Storage 200,000 gal.
X Tank T223 Concentrates llolding 1,000 gal.
X Tank T301 Reactor Coolant Drain 347 gal.
X X
Tank T302 Auxiliary Building 1,300 gal.
X X
X Drain Tank
Sheet 3 of 3 ATTACil!1ENT B Vent Gas Full Collection Loop Collection Equipment Vacuum fleader Seal lleader Number Service Capacity Capability (Passive)
(Passive)
(Active)
T303A Clean Waste Receiving 15,322 gal.
X Tank T303B Clean Maste Receiving 15,322 gal.
X Tank T304 Chemical Uaste Drain 6,500 gal.
X Tank JLT/4sa4A20
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