ML19221A618

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Task 100: Examination of Controlled Depressurization to Achieve Long-Term Cooling Status in Tmi
ML19221A618
Person / Time
Site: Crane Constellation icon.png
Issue date: 04/03/1979
From:
INDUSTRY ADVISORY GROUP
To:
References
OLS-790403, TASK 100, TASK-100, NUDOCS 7905230447
Download: ML19221A618 (24)


Text

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  • d THREE MELE ISLAND 3 April 1979 t.

e 166 007 e J s.. 7 905 23 0 9py ,7 C

4 CONTENTS ,/ r fh I. Introduction 4.s .II. Samary of Alttrnatives III. Discussion of Alternatives A. Description 8 Scheratic C. . uu: notions and Prerequisites D. Advantages and Disadvantages IV. Reco::mendations ~ e G ~4 O e G I e 6 3 ,...s e 166 008 ~

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/ f I. INTRODUCTION g A subccanittee w&s formed on 2 April' to examine concepts to depressurize, and achieve long term cooling status in the .i e' ~ g the Three Mile Island Plant. The comittee members were: f.WCST* T. Johnson (Chairma'n); J. 'J. Holman (NRC); R. Muench (West.); 'J. Hurley (Bechtc1) and L.'J. Ybarrando (EG&G). The scope of this assignment was to develop and evaluate conceptually techniques for Cepressurizing.the Three Mile Island (TMI) primary coolant system in a controlled manner considering the effect of dissolved gases on the pressure decrease. After achieving a stable lower pressure at which the residual heat removal system could be used we further evaluated a long term cooling option. g This report contains a tabular sucznary of the alternate con-rolled depressurization methods evaluated in section II. a discussion of the alternatives in section III and the subca:nittee recomendation in section IV. 3 166 009

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s Disadvantages i Q l. Could be slow depending on heat input frcca pressurizer steel and an.ount of manual control required. 2. Level control affected by RCS bubble. 1 1, l \\ .s

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= a (4) Temperature control of RCS provided by steaming the S/G.

Q (5) RCS being periodically vented to containment; racombiners maintaining containment H concent.'a tion.

(6)RCStemperaturesandpressurearestable. (7) Spray valve closed. Plant Fbneuver and Behavior Af ter achievement of initial conditions, the secondary side cooling is adjusted to maintain RCS temperature approximately constant throughout the depressurizati en to 300 psia. (Constant T is not essential; however, since time is not a factor, it is felt advcntaged to concentrate on one operation only ) There is probably a bubble in the RCS; its response to the maneuver is discussed under alternate 1. At the outset the pressurizer heaters are energizea cnd the vent valve (s) are opened slowly to the position calculated. This position should be such that., with the heaters 50% energized there is roasurable rate of pressure increase. The heaters are then deenergized and pressure is seen to drop at the predetermined rate. The heaters are cycled to adjust the rate of pressure decay. Should heater control be lost or the rate become too large the vent valves will be ir: mediately closed. Pressurizer level will be controlled automatically through MUV17; however, level may oscillate mildly as gases trapped in the RCS " slide" into the pressurizer. At about 400 psia one bank of heaters are turned on to case the pressure to stability at 300 psia. Some adjustment of the vent rate may be necessary. Final conditions reached are: ) Tave = 2800F T = 4150F pres; 300 psia P l ftlP still operating Variations The folicwing variations are also possible: 1. RCS ficw by natural circulation. Although heat impact to the RCS is reduced by about 4-5 Hw,the inherent difficultias in RCS temperature control '- make RCP operation preferable. 2. Pressure in unisolated full Ccre Flood tanks could lead the RCS manuever. This would previde protection against rapid depressurization. This variation introduced the risk of adding N2 to the already gas saturated RCS as well as cortplicating the evolution. 3. Cooldown coincident with depressurization. Plant staff would be controlling two operations and makeup rate would be increased. This variation is not recore:nended because' there is no need to cocplica te operation by trying to vary two parameters at once. Advantaces 1. Lcw makeup requirements 2. Minimizes mass lost from RCS to containment. 3. Positive control of pressure change. 4. Cessation of manaeser leaves plant in original operating configuraticn 5. Forced core cooling without liquid release. 6. Similar to nonnal operating procedures. 166 013

5 Controlled Depressurization Alternate #2 Depressurization by Steam Venting from the Pressu-izer e Description With a steam bubble in the pressurizer, pressure control is decoupled from temperacu.ae control of the reactor coolant system (RCS). Thus RCS pressure can be lowered in a deliberate, controlled manner by venting the pressurizer while cycling the pressurizer heaters. Pressurizer level is maintained through use of the level control feature of the Makeup and Purification System (MU&PS). Venting of the pressuri9r may aid degasification of the RCS with declining pressure. RCS temperature control is provided by heat transfer through the steam generator (s). The alternate can be performed both with or without the reactor coolant pump (RCP) operating. RCS makeup for level control may be obtained either from the makeup tank or the borated water storage tank (BWST). The makeup tank is also available for RCS chemistry control, if appropriate. Schmatic Piping, equipment, and instrumentatior. for' this alternate is shcwn on plan _t drowning 2024. Assumptions and Prerequisites 1. Emergency power to valves RC-RV2, RC-V2 and RC-V137 and to the pressurizer heaters. Backup power supplies (not necessarily Class IE) should be available to RCS and MU&PS instrumentation and MU-Vl7. 2. Control air should be available to operate A0V's in the MU&PS. 3. H recombiners available. 2 4. Enough instrumentation to maneuver the RCS and MUaPS available including at least RC temperature and pressure pressurizer temperrature and level, and steam generator pressure. 5., Either the BWST or Makeup Tank should be selected ar.d lined up as supply of makeup. 6. Calculations are complete to estimate. the arrount, of opening of RC-RV2 and RC-V137 and energy necessary to control depressurization a predetemined rate. Latent beat in the pressurizer should be factored into this calculation. 7. Calculations to estimate amount of water added to containment are complete. Sux.ary of Operation (with RCP operating) 0 Initial conditions: (1) RCS at 1970 psia, T,y, 2800 - 28S, and lA RCP in operation (2) Pressurizer maintair'ng 1070 psia with steam pressurizer. Heaters are operable, level is at a bou t 200". (3) MU&PS operational supplying seal water to all RCP's and controlling pressurizer level with MU-Vl7. 166 014

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