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Requests Proposed Changes to Tech Specs That Will Incorporate Secondary Water Chemistry Limiting Conditions for Operation & Surveillance Requirements.Submittal Should Include Basis for Proposed Limits
	ML20148J638
Person / Time
Site:	Yankee Rowe
Issue date:	08/18/1976
From:	Schwencer A; Office of Nuclear Reactor Regulation
To:	Groce R; YANKEE ATOMIC ELECTRIC CO.
References
	NUDOCS 8011250168
	Download: ML20148J638 (2)
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l AUG 1%1976 t

Docket No. 50-29

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r Yankee Atomic Electric Company THIS DOCUMENT CONTAINS ATTN: Mr. Robert H. Groce

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. g.3The steam! generator' tubing in_ pressurized water reactors (PWR's) _is r ypart of the: reactor, coolant presswe boundary.D Thus, in keeping with s

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.K10CFRPart50,; Appendix'A,: General DesignLCriterion 31, " Fracture m 6preventfee'of Reactor Coolant Pressure Beendary", the steam generator F

"y Ol tubing.should' remain? free of' cracks, perforations and general.

f fdeteriorationsto'ainimize the, likelihood of. failure. For. Some time,.

d the NRC;s.taff andtits ensultants.have been examining the factors that c

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5 Tcontribute to the degradation of steam generator. tubing. Based on the f'- resalts'of leboratory testing to,date and the operating experience that has been obtained by the industry, it is apparent that, although the

' mechanisms are'ceeples and varied,' the contamination of the steam generator. secondary coolant is.the fundamental e:ause of tube degradation l, and the impairment of tabeLintegrity. tit is she apparent that careful

_ control;ofLthel secondary water chemistry' serves to inhibit the potential-p; accumulation.of; corrosive;1mpur1. ties.1.n the steam generator and thereby j s

P11mits tube' degradation..e.g.y WHWIM.C N d.; < j v x.:.

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fConsequent1Y,71t'is 'the~ staff

~ f monitoring: requirements;should be me6e: pert of the Technical Specif1ca-E,.tions forf all PWR'sCle this ~ connection, we recognize that different 1.; utilities use differeet' secondary water' treatment methods to limit

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steam generator tabe corrosion.Mtoreovers.we recognize that a licensee's

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3 AUG 181976 !

Yankee Atomic Electric Company i

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il Accordingly, we request that you propose changes to your Techn ca

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i Specifications, within 30 days, that will incorporate secondary water chemistry limiting conditions for operation and surveillance requirements in accordance with the enclosed Model Technical examine your. current practices regarding.

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.: Specification

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% fsecondary,waterJchemistry(control in;11ght ohyour operating-e q,

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?MM J experience:and your:perticular plant.and;siteLeharacteristics ble' j ~M,-

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MDDEL (A)

, TECHNICAL SPECIFICATIONS

< PLANT SYSTEMS SECONDARY WATER CHEMISTRY LIMITING CONDITION FOR_0PERATION 3.Xxx The secondary water chemistry shall be maintained within the limits of Table 3.XX.

j APPLICABILITY:

Modes 1, 2 and 3.

ACTION:

a.

With the condenser condensate total cation conductivity exceeding its Steady State Limit but within its Transient Limit, restore the conductivity to within its Steady State Limit within 7 days; or, be

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in HOT SHUTDOWN within the next 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months .

l b.

With the condenser condensate total cation conductivity exceeding its Transient Limit, restore the conductivity to within the Transient Limit within 96 hours0.00111 days 0.0267 hours 1.587302e-4 weeks 3.6528e-5 months or be in HOT SHUTDOWN'within the next 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months .

c.

With the total cation conductivity of the' blowdown from any steam generator exceeding its Steady State Limit but within its Transient Limit, verify at least once per 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months that the pH and free hydroxide and total suspended solids in the steam' generator blowdown are within the limits of Table 3.XX, and restore the conductivity to within its Steady State Limit within 7 days; or, be in HOT SHUTDOWN

'within the next 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months .

d.

With the pH, or free hydroxide or total suspended solids of the blow-down from any steam generator exceeding its limit (s) restore the out-of-limit parameter (s) to within its limit (s) within 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months or be in HOT SHUTDOWN within the next 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months .

With the total cation confluctivity of the blowdown from any steam e.

generator exceeding its Transient Limit, restore che conductivity to within its limit within 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months or be in HOT SHUTDOWN within

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the next 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months .

SURVEILLANCE REQUIREMENTS _

4. xxx The secondary water chemistry parameters shall be determined to be within the limits at least once per 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months by analyzing the condenser condensate and steam generator blowdown for total cation co,nduc tivi ty.

3/4-X J9 Hat 0672

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' PLANT SYSTEMS _

I BASES 3/4.xxx SECONDARY WATER CHEMISTRY 1

Contamination of the steam generator seco'ndary coolant can causeGenerally,;

potential tube degradation and impair tube integrity. severe cl

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impurities that may accumulate on the secondary side of the steam gen-erator, or on the high heat flux surfaces of the steam generator tubes can lead to the potential for intergranular stress corrosi >n cracking.

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Monitoring of the condenser condensate by cation conductivity is an '

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The leakage rate effective means of detecting condenser tube inleakage.

can then be determined by comparing the cation concentration in the con-The i

densate with the cation concertration in the condenser cooling water.

cation conductivity of the steam generator blowdown will indicate when blowdown is required to remove the accumulation of caustic forming impurities Monitoring the pH and and the scale forming solids in the steam ' generator.

free hydroxic'e level in the blowdown provides a means to initiate balance of corrective actions needed to restore the operating secondary coolant.

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i tionitoring the total suspended solids in the blowdown wi sludge buildup.

l Controlling the secondary water chemistry within the specified limits

, ill control the potential accumulation of corrosive impurities in the These limits provide w

steam generator and minimize tube degradation. reasonable as the potential for tube degradation during all conditions of operation, and These measures ensure the continued protection of i

postulated accidents.the steam generator tubing which is an essential part o pressure boundary.

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TABLE 3. n,

4 SECONDARY WATER CHEMISTRY LIMITS Total Cation Conductivity Total Suipended Fred Hydroxide -

pH 9 25'c -

Solids ppm CACO,'

umhos/cm2 9 25'C Water -Sample Steady State Transient Location Limits Limits Limits Limits Limits e

N.A.

M.A.

Condenser 1( )

1()

Condensate Steam Generator 1( )

1 ( ).

()SpHf()

1()

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1 Blowdown u

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May be increased to' (

) for the first (

) hours during startup from HOT SHUTDOWN.

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. TABLE 1.xx OPERATIONAL MODES i

REACTIVITY 5 RATED AVERAGE COOLANT HDDE

_CONDITI N, K,ff THERMAL POWER

TEMPERATURE O

1. POWER OPERATION

> 0.99

> 55

> 350*F

~ 2.

STARTUP 1 0.99

< 5%

2.350*F 3.

HOT STANDBY

< 0.99 0

t350*F 4.

HOT SHUTDOWN

< 0.99 0

350*F > Tavg

> 200*F 5.

COLD SHUTDOWN

< 0.'99 0

< 200*F 6.

REFUELIN'G**

< 0.95 0

< 90*F Excluding decay heat.

- Reactor vessel head unbolted or removed and fuel in the vessel.

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ML20148J638

Text

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