ML19262A961

LER 79-102/03L-0:on 791108,reactor Water Conductivity Exceeded Tech Spec Limit.Caused by Decomposition of Ion Exchange Resins Which Altered Ph Level.Eight Condenser Tubes Plugged & One Condensate Demineralizer Removed

ML19262A961
Person / Time
Site:	FitzPatrick
Issue date:	12/05/1979
From:	W. Verne Childs POWER AUTHORITY OF THE STATE OF NEW YORK (NEW YORK
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19262A957	List: ML19262A956 ML19262A961
References
LER-79-102-03L, LER-79-102-3L, NUDOCS 7912110359
Download: ML19262A961 (4)

Text

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POWER AUTHORITY OF THE STATE OF NEW YORK JAMES A. FITZPATRICK NUCLEAR POWER PLANT DOCKET NO. 50-333 ATTACHMENT TO LER 79-102/03L-0 Page 1 of 3 During normal operation, reactor water conductivity exceeded the Technical Specification limit. The maximum abserved value of conductivity was 7.5 micromho/cm as compared to a limit of 5.0 micromho/cm as contained in Technical Specification, Appendix A, . Paragraph 3.6.C.4. Initially a conductivity increase was noted at 1300 hours0.015 days <br />0.361 hours <br />0.00215 weeks <br />4.9465e-4 months <br /> on November 8, 1979 and investigation into the cause of the increased conductivity was commenced.

At 1915 hours0.0222 days <br />0.532 hours <br />0.00317 weeks <br />7.286575e-4 months <br />, conductivity reached 3 micromho/cm, power was reduced from approximately 100% to 45% of rated power in preparation for possible shut-down, and isolation of main condenser water boxes to determine the source of leakage was commenced. Conductivity exceeded the Technical Specification limit at 2320 hours0.0269 days <br />0.644 hours <br />0.00384 weeks <br />8.8276e-4 months <br /> on November 8,1979 during the condenser tube plugging operation and returned below the limit at 1430 hours0.0166 days <br />0.397 hours <br />0.00236 weeks <br />5.44115e-4 months <br />, November 9,1979, when shutdown preparations were discontinued.

While the reactor water dissolved oxygen concentration was not directly monitored, the feedwater dissolved oxygen concentration was monitored. Since the dissolved oxygen in reactor water is a, proximately 21/2 times that found in feedwater under equilibrium conditions, C.' maximum concentration was probably less than 100 ppb in the reactor. In addition, monitoring of conductivity, pH, chloride and feedwater quality continued throughout the event. Complete details of reactor water sampling data and other parameters of concern are included in this attachment.

The FitzPatrick Plant staff has thoroughly reviewed the transient and NED0-10899 titled " Chloride Control in BWR Coolants" which indicates that while high conductivity is undesirable, no damage to the reactor fuel or the reactor coolant pressure boundary should result because both the chloride and dissolved oxygen concentrations remained low throughout the transient.

Therefore, the event did not represent a significant hazard to the pub.ic health and safety.

As indicated in the tabulation of chemistry r asults included in this attachment, conductivity did not respond to the power decrease and the reactor coolant pH decreased to values which would rot be expected as a result of condenser tube leakage alone. Additional investiption indicates that the low pH values were probably due to the addition of some 1on exchange resin material to the reactor vessel. Decomposition of this material at the high temperatures found in the reactor vessel produces quantities of acids which reduce the pH. Investigation into the possible sources of resins revealed that one condensate demineralizer bed, which was in service throughout the transient, contained a significant quantity of fine material. It is t r al s he result of fracturing of a quantity o lon exch 9e es n aning operations or the presence of powdered resin od n the ion exchange bed which should contain on j beaded materia . A o al f 8 condenser tubes were ; lugged and one condensate demineralizer was removed from service permitting a return to rated power.

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POWER AUTHORITY OF THE STATE OF NEW YORK JAMES A. FITZPATRlCK NUCLEAR POWER PLANT cys P

DOCKET NO. 50-333 N

ATTACHMENT TO LER 79-102/03L-0 Page 2 of 3 cy3 N

REACTOR WATER FEEDWATER tr7 CHLORIDE CONDUCTIVITY Diss0LVED CONDUCTIVITY c-DATE TIME (ppb)* oji, (mi c romho/cm)

• 09 (ppb) (micromho/cm) REMARKS i

11/ 8/79 0845 45 5.8 0.73 30 0.06 Reutine Analysis prior to event - Cleanup system influent 1345 --

5.0 1.20 -- --

Cleanup system influent 1430 --

5.1 1.50 -- --

Cleanup system i n f l ue nt 1830 38 5.0 2.7 -- --

Cleanup system influent 11/ 8/79 1915 -- --

3.0 -- --

Power reduction from 100% to 45%, commenced tube plugging operation 2000 40 4.9 3.4 20 0.08 Cleanup system influent Conductivity indication 11/ 8/79 2320 -- --

5.0 -- --

at Technical Speci fication limi t 2330 38 4.7 5.5 24 0.18 Cleanup system influent 11/ 9/79 0100 -- --

5.6 -- --

Cleanup system influent 0215 -- --

5.4/6.1 -- --

Cleanup system influent /

Rec 3 ,ulation Loop 0330 50 4.6 5 5/6.5 -- --

Cleanup system influent /

Recirculation loop 0430 -- --

5 1/5.9 -- --

Cleanup system influent /

Recirculation Loop 0530 -- --

5.2/6.4 -- --

Cleanup cystem influent /

Recirculation Loop 0635 --

4.2 6.7/7.5 -- --

Cleanup system influent /

Recirculation Loop i

I l _

POWER AUTHORITY OF THE STATE OF NEW YORK JAMES A. FITZPATRlCK NUCLEAR POWER PLANT DOCKET NO. 50-333 (([

C'd ATTACHMENT TO LER 79-102/03L-0 Page 3 of 3 CO REACTOR WATER FEEDWATER csJ CHLORIDE CONDUCTIVITY Diss0LVED CONDUCTIVITY Lf7 (ppb)

• fil, 0 9 (ppb)

DATE TIME (mi c romho/cm) * (micromho/cm) REMARKS 11/ 9/79 0730 30 4.7 .

5.75/6.7 -- --

Cleanup system influent /

Recirculation Loop 1000 35 5.0 4.9 25 --

Cleanup system influent 1230 < 20 4.7 6.4 -- --

Cleanup system influent 1430 -- --

4.95 -- --

Cleanup system influent 1630 76 4.9 3.9 -- --

Cleanup system influent 2030 70 4.9 3.0 -- --

Cleanup system influent 11/10/79 0030 < 20 5.0 2.7 -- --

Clean,ip system influent 0400 44 5.0 2.9 -- --

Cleanup system influent 0800 90 5.1 2.45 -- --

Cleanup system influent 1205 52 5.0 g

'2.1 Cleanup system influent 1600 44 5.0 1.65 -- --

Cleanup system influent 11/11/79 0600 < 20 5.0 1.40 -- --

Cleanup system influent 11/12/79 0145 < 20 5.4 0.82 23 0.06 Cleanup system influent 11/13/79 2100 -- -- -- -- --

Tube plugging operations complete, began power ascension to 100%

• Technica l specific ation limits for chloride and conducti d ty are 500 ppt and 5.0 micromho/ cm respectively.

• NOTE: L ER79-076 c nd 79-096 ar e relatc d events.

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